Update .gitignore to properly ignore target.

.gitignore

@@ -19,7 +19,7 @@
 *.zip
 *.tar.gz
 *.rar
-target/
+target/*
 
 # virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml
 hs_err_pid*
@@ -56,4 +56,4 @@ nbdist/
 .nb-gradle/
 
 # Secrets!
-secrets.yml
+secrets.yml