Update environments.yml

.yamato/environments.yml

 # sticking to 2019.4.6f1 for testing for now because Linux Editor fails to open PerceptionHDRP on 2019.4.8f1
 # see https://fogbugz.unity3d.com/default.asp?1273518_d68j5lb6eucglb84
 coverage_editors:
-  - version: 2019.4.6f1
+  - version: 2020.1.15f1
-per_commit_editors:
-  - version: 2019.4.6f1
+per_commit_editors:  
-  - version: 2020.2.0b13
+  - version: 2020.2.0b11
-  - version: 2020.2.0b13  
+  - version: 2020.2.0b11  
 
 publish_platforms:
   - name: win