Drop python 3.6 and add 3.9 testing (#1000)

* Drop python 3.6 and add 3.9 testing

* Correct python constraint in environment yml files

* pin foyer version

* remove typo in env yml

Author: daico007

azure-pipelines.yml

@@ -30,24 +30,24 @@ stages:
       - job: NoBleeding
         strategy:
           matrix:
-            Python36Ubuntu:
-              imageName: 'ubuntu-latest'
-              python.version: 3.6
             Python37Ubuntu:
               imageName: 'ubuntu-latest'
               python.version: 3.7
             Python38Ubuntu:
               imageName: 'ubuntu-latest'
               python.version: 3.8
-            Python36macOS:
-              imageName: 'macOS-latest'
-              python.version: 3.6
+            Python39Ubuntu:
+              imageName: 'ubuntu-latest'
+              python.version: 3.9
             Python37macOS:
               imageName: 'macOS-latest'
               python.version: 3.7
             Python38macOS:
               imageName: 'macOS-latest'
               python.version: 3.8
+            Python39macOS:
+              imageName: 'macOS-latest'
+              python.version: 3.9
 
         pool:
           vmImage: $(imageName)
@@ -113,12 +113,12 @@ stages:
           vmImage: 'windows-latest'
         strategy:
           matrix:
-            Python36:
-              python.version: 3.6
             Python37:
               python.version: 3.7
             Python38:
               python.version: 3.8
+            Python39:
+              python.version: 3.9
 
         steps:
           - powershell: Write-Host "##vso[task.prependpath]$env:CONDA\Scripts"

environment-dev.yml

@@ -6,7 +6,7 @@ dependencies:
   - codecov
   - ele
   - gmso>=0.7.3
-  - foyer>=0.9.4
+  - foyer>=0.11.0
   - freud>=2.0.0
   - garnett>=0.7.1
   - gsd>=2
@@ -27,6 +27,6 @@ dependencies:
   - pytest
   - pytest-azurepipelines
   - pytest-cov
-  - python<=3.8
+  - python>=3.7
   - rdkit
   - scipy

environment-win.yml

@@ -7,7 +7,7 @@ dependencies:
   - codecov
   - ele
   - gmso>=0.7.3
-  - foyer>=0.9.4
+  - foyer>=0.11.0
   - garnett>=0.7.1
   - gsd>=1.2
   - intermol
@@ -25,6 +25,6 @@ dependencies:
   - pycifrw
   - pytest>=3.0
   - pytest-cov
-  - python<=3.8
+  - python>=3.7
   - rdkit
   - scipy