Add wttr.in to integrations

Author: kovidgoyal

docs/integrations.rst

@@ -70,6 +70,9 @@ System and data visualisation tools
 `onefetch <https://github.com/o2sh/onefetch>`_
     a tool to fetch information about your git repositories
 
+`wttr <https://github.com/chubin/wttr.in>`_
+    a tool to display weather information in your terminal with curl
+
 
 Editor integration
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