Merge branch 'develop'

* develop: (21 commits)
  bugfix: #32 Runtime Error for nested sync fns
  chore: renamed history to changelog dependabot
  bugfix: resolves #31 aiohttp lazy import
  chore: grammar issues
  improv: add project tenets
  Improv tracer - async support, patch, test coverage and X-Ray escape hatch (#29)
  Bugfix: "per second" metric units (#27)
  fix: #24 correct example test and docs
  chore: bump example to use 0.8.0 features
  Adopt logging best practices (#23)
  Decorator factory Feat: Create your own middleware (#17)
  chore: clean up CI workflows
  fix: CI attempt 4
  fix: CI attempt 3
  fix: CI attempt 3
  fix: CI attempt 2
  feat: add docs to CI
  chore: fix github badge typo
  chore: pypi monthly download badge
  fix: add missing single_metric example; test var name
  ...

Author: heitorlessa

Diff for: README.md

@@ -1,9 +1,20 @@
 # Lambda Powertools
 
-![PackageStatus](https://img.shields.io/static/v1?label=status&message=beta&color=blueviolet?style=flat-square) ![PythonSupport](https://img.shields.io/static/v1?label=python&message=3.6%20|%203.7|%203.8&color=blue?style=flat-square&logo=python)
+![Python Build](https://github.com/awslabs/aws-lambda-powertools/workflows/Powertools%20Python/badge.svg?branch=master)
 
 A suite of utilities for AWS Lambda Functions that makes tracing with AWS X-Ray, structured logging and creating custom metrics asynchronously easier.
 
+## Tenets
+
+* **AWS Lambda only** – We optimise for AWS Lambda function environments only. Utilities might work with web frameworks and non-Lambda environments, though they are not officially supported.
+* **Eases the adoption of best practices** – The main priority of the utilities is to facilitate best practices adoption, as defined in the AWS Well-Architected Serverless Lens; all other functionality is optional.
+* **Keep it lean** – Additional dependencies are carefully considered for security and ease of maintenance, and prevent negatively impacting startup time. 
+* **We strive for backwards compatibility** – New features and changes should keep backwards compatibility. If a breaking change cannot be avoided, the deprecation and migration process should be clearly defined.
+* **We work backwards from the community** – We aim to strike a balance of what would work best for 80% of customers. Emerging practices are considered and discussed via Requests for Comment (RFCs)
+* **Idiomatic** – Utilities follow programming language idioms and language-specific best practices.
+
+_`*` Core utilities are Tracer, Logger and Metrics. Optional utilities may vary across languages._
+
 ## Powertools available
 
 * [Python - Beta](./python/README.md)

Diff for: python/.flake8

@@ -2,12 +2,11 @@
 exclude = docs, .eggs, setup.py, example, .aws-sam
 ignore = E203, E266, W503, BLK100, W291, I004
 max-line-length = 120
-max-complexity = 18
+max-complexity = 15
 
 [isort]
 multi_line_output = 3
 include_trailing_comma = true
 force_grid_wrap = 0
 use_parentheses = true
 line_length = 120
-

Diff for: python/CHANGELOG.md

@@ -0,0 +1,78 @@
+# HISTORY 
+
+## May 16th
+
+**0.9.3**
+
+* **Tracer**: Bugfix - Runtime Error for nested sync due to incorrect loop usage
+
+## May 14th
+
+**0.9.2**
+
+* **Tracer**: Bugfix - aiohttp lazy import so it's not a hard dependency
+
+## May 12th
+
+**0.9.0**
+
+* **Tracer**: Support for async functions in `Tracer` via `capture_method` decorator
+* **Tracer**: Support for `aiohttp` via `aiohttp_trace_config` trace config
+* **Tracer**: Support for patching specific modules via `patch_modules` param
+* **Tracer**: Document escape hatch mechanisms via `tracer.provider`
+
+## May 1st
+
+**0.8.1**
+
+* **Metrics**: Fix metric unit casting logic if one passes plain string (value or key)
+* **Metrics: **Fix `MetricUnit` enum values for
+    - `BytesPerSecond`
+    - `KilobytesPerSecond`
+    - `MegabytesPerSecond`
+    - `GigabytesPerSecond`
+    - `TerabytesPerSecond`
+    - `BitsPerSecond`
+    - `KilobitsPerSecond`
+    - `MegabitsPerSecond`
+    - `GigabitsPerSecond`
+    - `TerabitsPerSecond`
+    - `CountPerSecond`
+
+## April 24th
+
+**0.8.0**
+
+* **Logger**: Introduces `Logger` class for stuctured logging as a replacement for `logger_setup`
+* **Logger**: Introduces `Logger.inject_lambda_context` decorator as a replacement for `logger_inject_lambda_context`
+* **Logger**: Raise `DeprecationWarning` exception for both `logger_setup`, `logger_inject_lambda_context`
+
+## April 20th, 2020
+
+**0.7.0**
+
+* **Middleware factory**: Introduces Middleware Factory to build your own middleware via `lambda_handler_decorator`
+* **Metrics**: Fixes metrics dimensions not being included correctly in EMF
+
+## April 9th, 2020
+
+**0.6.3**
+
+* **Logger**: Fix `log_metrics` decorator logic not calling the decorated function, and exception handling
+
+## April 8th, 2020
+
+**0.6.1**
+
+* **Metrics**: Introduces Metrics middleware to utilise CloudWatch Embedded Metric Format
+* **Metrics**: Adds deprecation warning for `log_metrics`
+
+## February 20th, 2020
+
+**0.5.0**
+
+* **Logger**: Introduces log sampling for debug - Thanks to [Danilo's contribution](https://github.com/awslabs/aws-lambda-powertools/pull/7)
+
+## November 15th, 2019 
+
+* Public beta release

Diff for: python/HISTORY.md

@@ -20,7 +20,7 @@ test:
 coverage-html:
 	poetry run pytest --cov-report html
 
-pr: lint test 
+pr: lint test security-baseline complexity-baseline
 
 build: pr
 	poetry run build
@@ -31,6 +31,15 @@ docs: dev
 docs-dev:
 	poetry run pdoc --http : aws_lambda_powertools
 
+security-baseline:
+	poetry run bandit --baseline bandit.baseline -r aws_lambda_powertools
+
+complexity-baseline:
+	$(info Maintenability index)
+	poetry run radon mi aws_lambda_powertools
+	$(info Cyclomatic complexity index)
+	poetry run xenon --max-absolute C --max-modules A --max-average A aws_lambda_powertools
+
 #
 # Use `poetry version <major>/<minor></patch>` for version bump
 #