Merge branch 'master' into 'master'

updates groups

See merge request codechina/operation-work!50

explore/index.yml

@@ -2,21 +2,21 @@ banner:
 - link: https://codechina.csdn.net/courses/detail/2/l?utm_source=explore
   url: https://codechina.csdn.net/codechina/operation-work/uploads/6a42cb09830df2ead3d3d62cde6bc1b5/markdown-banner.jpg
 groups:
-- ' xiaomi'
-- ' xianxinmao1'
-- ' xazbkj'
-- ' wechaty'
-- ' webide'
-- ' webank'
-- ' web_ide'
-- ' testmirror'
-- ' teebbstudios'
-- ' taosdata'
-- ' takeya-yuki'
-- ' sureness'
-- ' secondstate'
-- ' second-state'
-- ' rt-thread'
+- xiaomi
+- xianxinmao1
+- xazbkj
+- wechaty
+- webide
+- webank
+- web_ide
+- testmirror
+- teebbstudios
+- taosdata
+- takeya-yuki
+- sureness
+- secondstate
+- second-state
+- rt-thread
 learning_banner:
 - link: https://codechina.csdn.net/courses
   url: https://codechina.csdn.net/codechina/operation-work/uploads/38be577289ba8800a9caa233416cd4b6/1920x480_1_.png