adding new stuff

plugins/bundle/vim-airline/ISSUE_TEMPLATE.md

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+#### environment
+
+- vim: ????
+- vim-airline: ????
+- OS: ????
+- Have you reproduced with a minimal vimrc: ???
+- What is your airline configuration: ???
+if you are using terminal:
+- terminal: ????
+- $TERM variable: ???
+- color configuration (:set t_Co?):
+if you are using Neovim:
+- does it happen in Vim: ???
+
+#### actual behavior
+
+????
+
+#### expected behavior
+
+????