Minor edit to readme (#141)

Corrected opening "Lambda Functions" to "Lambda functions"

Author: Ben Smith

README.md

@@ -3,7 +3,7 @@
 ![Build](https://github.com/awslabs/aws-lambda-powertools/workflows/Powertools%20Python/badge.svg?branch=master)
 ![PythonSupport](https://img.shields.io/static/v1?label=python&message=3.6%20|%203.7|%203.8&color=blue?style=flat-square&logo=python) ![PyPI version](https://badge.fury.io/py/aws-lambda-powertools.svg) ![PyPi monthly downloads](https://img.shields.io/pypi/dm/aws-lambda-powertools)
 
-A suite of utilities for AWS Lambda Functions that makes tracing with AWS X-Ray, structured logging and creating custom metrics asynchronously easier.
+A suite of utilities for AWS Lambda functions that makes tracing with AWS X-Ray, structured logging and creating custom metrics asynchronously easier.
 
 **[📜Documentation](https://awslabs.github.io/aws-lambda-powertools-python/)** | **[API Docs](https://awslabs.github.io/aws-lambda-powertools-python/api/)** | **[🐍PyPi](https://pypi.org/project/aws-lambda-powertools/)** | **[Feature request](https://github.com/awslabs/aws-lambda-powertools-python/issues/new?assignees=&labels=feature-request%2C+triage&template=feature_request.md&title=)** | **[🐛Bug Report](https://github.com/awslabs/aws-lambda-powertools-python/issues/new?assignees=&labels=bug%2C+triage&template=bug_report.md&title=)** | **[Kitchen sink example](https://github.com/awslabs/aws-lambda-powertools-python/tree/develop/example)** | **[Detailed blog post](https://aws.amazon.com/blogs/opensource/simplifying-serverless-best-practices-with-lambda-powertools/)**