Create pull request template (#199)

.github/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,19 @@
+## Description:
+
+
+**Related issue (if applicable):** fixes <link to issue>
+
+**Pull request in [esphomedocs](https://github.com/OttoWinter/esphomedocs) with documentation (if applicable):** OttoWinter/esphomedocs#<esphomedocs PR number goes here>
+**Pull request in [esphomeyaml](https://github.com/OttoWinter/esphomeyaml) with YAML changes (if applicable):** OttoWinter/esphomeyaml#<esphomeyaml PR number goes here>
+
+## Example entry for YAML configuration (if applicable):
+```yaml
+
+```
+
+## Checklist:
+  - [ ] The code change is tested and works locally.
+  - [ ] Check this box if you have read, understand, comply, and agree with the [Code of Conduct](https://github.com/OttoWinter/esphomelib/blob/master/CODE_OF_CONDUCT.md).
+
+If user exposed functionality or configuration variables are added/changed:
+  - [ ] Documentation added/updated in [esphomedocs](https://github.com/OttoWinter/esphomedocs).