change version number

snap/snapcraft.yaml

 name: tdengine
 base: core18
-version: '2.1.5.0'
+version: '2.1.6.0'
 icon: snap/gui/t-dengine.svg
 summary: an open-source big data platform designed and optimized for IoT. 
 description: |
@@ -72,7 +72,7 @@ parts:
       - usr/bin/taosd
       - usr/bin/taos
       - usr/bin/taosdemo
-      - usr/lib/libtaos.so.2.1.5.0
+      - usr/lib/libtaos.so.2.1.6.0
       - usr/lib/libtaos.so.1
       - usr/lib/libtaos.so