Release v0.12.0 with FF80 (#727)

* Upgrade to FF79

* Fixed test_cache_hits_recorded

* Preparing release v0.12.0 with FF80

* Added regression note

CHANGELOG.md

@@ -1,5 +1,21 @@
 # Changelog
 
+
+## v0.12.0 - 2020-08-26
+
+Firefox 80.0.0 release
+
+There have been no new features added in this release.
+However there are two significant bugfixes worth highlighting:
+
+- We hopefully fixed [a bug when hashing content](https://github.com/mozilla/OpenWPM/issues/711) where the same file could have multiple hashes
+  If you ran a big crawl and could repeat @birdsarah's analysis, we'd be grateful if you reported your results [here](https://github.com/mozilla/OpenWPM/issues/719)
+- Fixed longstanding bug when [propagating exceptions from the BrowserManager to the TaskManager](https://github.com/mozilla/OpenWPM/issues/547) you should now be seeing
+  the exception that happened in the BrowserManager in your logs
+
+__NOTE:__ Please be aware that this release contains a regression related to https://bugzilla.mozilla.org/show_bug.cgi?id=1656405 and https://bugzilla.mozilla.org/show_bug.cgi?id=1599160.
+This means some requests with cached responses might not show up as requests or responses in your instrumentation. We assume this will be fixed in FF81.
+
 ## v0.11.0 - 2020-07-08
 
 Firefox 78.0.1 scheduled release. This release contains some minor bug fixes

VERSION

@@ -1 +1 @@
-0.11.0
+0.12.0