Skip vim's "not a terminal" warning for tests

Author: jparise

Makefile

@@ -3,7 +3,7 @@
 all: test
 
 test: test/vader.vim
-	cd test && vim -Nu vimrc -c 'Vader! *' > /dev/null
+	cd test && vim -Nu vimrc -c 'Vader! *' --not-a-term > /dev/null
 
 test/vader.vim:
 	git clone --depth 1 https://github.com/junegunn/vader.vim test/vader.vim