[skip changelog] bump packages to support Python 3.8 (#517)

* use pip-tools, bump packages to support 3.8

* Bump Python to 3.8 in the CI environment

Author: Massimiliano Pippi

Diff for: .github/workflows/test.yaml

@@ -67,7 +67,7 @@ jobs:
       - name: Install Python
         uses: actions/setup-python@v1
         with:
-          python-version: '3.7'
+          python-version: '3.8'
           architecture: 'x64'
 
       - name: Run integration tests

Diff for: test/requirements.in

@@ -0,0 +1,6 @@
+pytest==5.3.1
+simplejson==3.17.0
+semver==2.9.0
+pyserial==3.4
+# temporary, replaces invoke==1.3.0 in favour of https://github.com/pyinvoke/invoke/pull/661
+git+https://github.com/flazzarini/invoke.git

Diff for: test/requirements.txt

@@ -1,25 +1,19 @@
-astroid==2.2.5
-atomicwrites==1.3.0
-attrs==19.1.0
-importlib-metadata==0.18
-# temporary, replaces invoke==1.3.0 in favour of https://github.com/pyinvoke/invoke/pull/661
+#
+# This file is autogenerated by pip-compile
+# To update, run:
+#
+#    pip-compile
+#
+attrs==19.1.0             # via pytest
 git+https://github.com/flazzarini/invoke.git
-isort==4.3.21
-lazy-object-proxy==1.4.1
-mccabe==0.6.1
-more-itertools==7.1.0
-packaging==19.0
-pep8==1.7.1
-pluggy==0.12.0
-py==1.8.0
-pylint==2.3.1
-pyparsing==2.4.0
+more-itertools==7.1.0     # via pytest
+packaging==19.0           # via pytest
+pluggy==0.13.1            # via pytest
+py==1.8.0                 # via pytest
+pyparsing==2.4.0          # via packaging
 pyserial==3.4
-pytest==5.1.3
-semver==2.8.1
-simplejson==3.16.0
-six==1.12.0
-typed-ast==1.4.0
-wcwidth==0.1.7
-wrapt==1.11.2
-zipp==0.5.2
+pytest==5.3.1
+semver==2.9.0
+simplejson==3.17.0
+six==1.12.0               # via packaging
+wcwidth==0.1.7            # via pytest