Remove explain changes section from PR template (#1876)

.github/PULL_REQUEST_TEMPLATE.md

@@ -1,25 +1,22 @@
 # What does this implement/fix? 
 
-Quick description 
+Quick description and explanation of changes
 
 ## Types of changes
 
 - [ ] Bugfix (non-breaking change which fixes an issue)
 - [ ] New feature (non-breaking change which adds functionality)
 - [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
-- [ ] Configuration change (this will require users to update their yaml configuration files to keep working)
+- [ ] Other
 
 **Related issue or feature (if applicable):** fixes <link to issue>
 
 **Pull request in [esphome-docs](https://github.com/esphome/esphome-docs) with documentation (if applicable):** esphome/esphome-docs#<esphome-docs PR number goes here>
-  
-# Test Environment
+
+## Test Environment
 
 - [ ] ESP32
 - [ ] ESP8266
-- [ ] Windows
-- [ ] Mac OS
-- [ ] Linux
 
 ## Example entry for `config.yaml`:
 <!--
@@ -34,11 +31,6 @@ Quick description
 
 ```
 
-# Explain your changes
-
-Describe your changes here to communicate to the maintainers **why we should accept this pull request**.
-Very important to fill if no issue linked
-
 ## Checklist:
   - [ ] The code change is tested and works locally.
   - [ ] Tests have been added to verify that the new code works (under `tests/` folder).