[hotfix] ignore .vscode folder in .gitignore (#580)

Author: zhuangchong

.gitignore

@@ -14,12 +14,17 @@ target
 *.jar
 *.log
 *.pyc
-.DS_Store
 build-target
 *.ipr
 *.iws
 dependency-reduced-pom.xml
 
+### VS Code ###
+.vscode/
+
+### Mac OS ###
+.DS_Store
+
 # website & docs
 website/node_modules
 website/build