update .gitpod.yml (#42)

Author: shenxianpeng

.gitpod.yml

@@ -3,4 +3,7 @@
 # and commit this file to your remote git repository to share the goodness with others.
 
 tasks:
-  - init: pip install -e .
+  - name: Setup & Install
+    before: pip install -r requirements-dev.txt
+    init: pre-commit install
+    command: pip install -e .