update Python tests

- drop 2.7 (see #152)
- add 3.6
- note: 3.9 not supported in MDAnalysis 1.1.1
- update CHANGELOG

.github/workflows/gh-ci.yaml

@@ -27,12 +27,9 @@ jobs:
     strategy:
         fail-fast: false
         matrix:
-          os: [ubuntu-latest, ]
-          python-version: [2.7, 3.7, 3.8]
+          os: [ubuntu-latest,]
+          python-version: [3.6, 3.7, 3.8]
           include:
-            - name: macOS_bigsur_py39
-              os: macOS-11
-              python-version: 3.8
             - name: macOS_catalina_py37
               os: macOS-10.15
               python-version: 3.7
@@ -140,7 +137,7 @@ jobs:
       run: |
         conda install setuptools twine
 
-    - name: install PMDA
+    - name: package PMDA
       run: |
         python setup.py sdist
 

CHANGELOG

@@ -18,6 +18,11 @@ MM/DD/YYYY VOD555, lilyminium, orbeckst, yuxuanzhuang
 
   * 0.4.0
 
+Changes
+  * requires MDAnalysis >= 1.0.0 and <2.0.0 (#122)
+  * dropped official support for Python 2.7 and 3.5 (all versions
+    of Python >= 3.6 supported by MDAnalysis 1.x are supported) (#152)
+
 Enhancements
   * Update doc theme to use sphinx-rtd-theme (Issue #124, PR #126)
   * add parallel hbond analysis class (Issue #95)
@@ -32,10 +37,6 @@ Fixes
   * fixed Contact fails with uneven blocks. (#140)
   * raise ValueError when n_blocks > n_frames (Issue #137, PR #138)
 
-Changes
-  * requires MDAnalysis >= 1.0.0 and <2.0.0 (#122)
-  * dropped official support for Python 3.5 (2.7 and >= 3.6 are supported)
-
 
 10/14/2019 VOD555, nawtrey