Added release notes for 11.7

Author: anitaa1990

CHANGELOG.md

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 Contains editorialized release notes. Raw release notes should go into `RELEASE-NOTES.txt`.
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+## 11.7
+Did you know we've added a new analytics section? It's now possible to select custom date ranges when viewing your stats! Simply click on the See More button under the store stats to check it out.
+
 ## 11.6
 Good news! We added a new analytics section to the app! Simply click on the See More button under the store stats to check more detailed information on Revenue and Orders. This isn’t the last of it – more updates to come in the next few weeks!