Single template (#546)

* merged all of the templates into one so the text will auto fill when a PR is created.
* was running into this issue documented here with auto fill -> https://stackoverflow.com/questions/52139192/github-pull-requests-template-not-showing

Author: ith-harvey

.github/PULL_REQUEST_TEMPLATE/cosmetic_src_changes.md

@@ -0,0 +1,37 @@
+
+<!---
+No need to add special tag
+src/ & non src/ changes you need the following (that apply):
+-->
+# Description of change
+## High level
+* <DESCRIP_OF_CHANGE>
+  * <DESCRIP_OF_SUBCHANGE>
+
+<!---
+Add the `Status: Needs Auditor Approval` tags
+CHANGES IN /SRC DIR:
+- renaming (not retyping or resizing) of variables & methods
+- reordering and moving of functions in files
+- lite moving of functions accross files
+- comments
+
+src/ changes you need the following (that apply):
+-->
+
+# Description of bug or vulnerability and solution
+* <PARAGRAPH_EXP_OF_VULN_BUG>
+* <PARAGRAPH_EXP_OF_HOW_CHANGE_SOLVES_VULN_OR_BUG>
+
+# Contract size
+## Pre Change
+<PASTE_OUTPUT_HERE>
+## Post Change
+<PASTE_OUTPUT_HERE>
+
+# Gas usage
+## Pre Change
+<PASTE_OUTPUT_HERE>
+## Post Change
+<PASTE_OUTPUT_HERE>
+