Bug 1331168 - Add initial release version to core ping documentation. r=sebastian

toolkit/components/telemetry/docs/data/core-ping.rst

@@ -163,7 +163,7 @@ Version history
 * v4: ``profileDate`` will return package install time when times.json is not available
 * v3: added ``defaultSearch``
 * v2: added ``distributionId``
-* v1: initial version
+* v1: initial version - shipped in `Fennec 45 <https://bugzilla.mozilla.org/show_bug.cgi?id=1205835>`_.
 
 Notes
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