Language tweaks to PULL_REQUEST_TEMPLATE.md (#1173)

.github/PULL_REQUEST_TEMPLATE.md

@@ -3,9 +3,9 @@ Make sure you have checked all steps below.
 ### Prerequisite
 * [ ] Please consider implementing the feature as a hook script or plugin as a first step.
   * pyenv has some powerful support for plugins and hook scripts. Please refer to [Authoring plugins](https://github.com/pyenv/pyenv/wiki/Authoring-plugins) for details and try to implement it as a plugin if possible.
-* [ ] Please consider contributing the patch upstream to [rbenv](https://github.com/rbenv/rbenv), since we have borrowed most of the code from this project.
-  * We are occasionally importing the changes from rbenv. In general, you can expect some changes made in rbenv will be imported to pyenv too, eventually.
-  * Generally speaking, we sometimes don't prefer to make some change in the core to keep compatibility with rbenv.
+* [ ] Please consider contributing the patch upstream to [rbenv](https://github.com/rbenv/rbenv), since we have borrowed most of the code from that project.
+  * We occasionally import the changes from rbenv. In general, you can expect changes made in rbenv will be imported to pyenv too, eventually.
+  * Generally speaking, we prefer not to make changes in the core in order to keep compatibility with rbenv.
 * [ ] My PR addresses the following pyenv issue (if any)
   - https://github.com/pyenv/pyenv/issues/XXXX