PR_TEMPLATE: Fix links to top-level policy files

Forgot to include `blob/master` in the URLs.

Author: mbland

.github/PULL_REQUEST_TEMPLATE.md

@@ -4,9 +4,9 @@
   contribution under the same terms as [this project's license][license], and
   that I have the right to license my contribution under those terms.
 
-[contrib]: https://github.com/mbland/go-script-bash/CONTRIBUTING.md
-[conduct]: https://github.com/mbland/go-script-bash/CODE_OF_CONDUCT.md
+[contrib]: https://github.com/mbland/go-script-bash/blob/master/CONTRIBUTING.md
+[conduct]: https://github.com/mbland/go-script-bash/blob/master/CODE_OF_CONDUCT.md
 [gh-tos]:  https://help.github.com/articles/github-terms-of-service/#6-contributions-under-repository-license
-[license]: https://github.com/mbland/go-script-bash/LICENSE.md
+[license]: https://github.com/mbland/go-script-bash/blob/master/LICENSE.md
 
 cc: @mbland