Improve pull_request_template

Signed-off-by: Etienne CHAMPETIER <champetier.etienne@gmail.com>

.github/pull_request_template

@@ -1,4 +1,4 @@
-Maintainer: me / @<github-user> / name <email>
+Maintainer: me / @<github-user>
 Compile tested: (put here arch, model, OpenWRT/LEDE version)
 Run tested: (put here arch, model, OpenWRT/LEDE version, tests done)
 
@@ -13,4 +13,4 @@ Please double check that your commits:
 Please also read https://github.com/openwrt/packages/blob/master/CONTRIBUTING.md
 
 Thanks for your contribution
-To finish, please remove this text (from ---)
+To show that you've read until here, please remove everything after ---