Merge branch 'googlecolab' into 'master'

add googlecolab

See merge request codechina/mirrors-settings!420

projects/googlecolab/imports.yml

+---
+group:
+  name: 'googlecolab'
+  description: ''
+  projects:
+  - name: 'colabtools'
+    description: ''
+    mirrorRelease: false
+    topic: ''
+  - name: 'jupyter_http_over_ws'
+    description: ''
+    mirrorRelease: false
+    topic: ''
+  - name: 'open_in_colab'
+    description: ''
+    mirrorRelease: false
+    topic: ''
+  - name: 'colab-widgets'
+    description: ''
+    mirrorRelease: false
+    topic: ''
+  - name: 'tswidgets'
+    description: ''
+    mirrorRelease: false
+    topic: ''
+  
\ No newline at end of file