Use maxdepth instead of depth in makefile, closes #652

Author: sheerun

Makefile

@@ -7,4 +7,4 @@ test:
 	@ scripts/test
 
 dev:
-	@ find scripts autoload/polyglot ftdetect tests . -type f -depth 1 | DEV=1 entr bash -c 'make && make test'
+	@ find scripts autoload/polyglot ftdetect tests . -type f -maxdepth 1 | DEV=1 entr bash -c 'make && make test'