Issue 839 pfe tabs history firefox (#841)

*  pfe-tabs-history focus issue
* Update demo file for testing hash links & focus
* stopping the popstate handler from setting focus
* Update CHANGELOG, add todo note for the test suite

Author: kylebuch8

CHANGELOG-prerelease.md

@@ -1,8 +1,9 @@
 ## Prerelese 45 ( TBD )
 
-- [](https://github.com/patternfly/patternfly-elements/commit/) fix: pfe-tabs adding dynamic tab in IE11 #838
+- [9381e37](https://github.com/patternfly/patternfly-elements/commit/9381e37cd7530c5aebb9a7b596cb47704165b38d) fix: pfe-tabs adding dynamic tab in IE11 #838
 - [eb74cb8](https://github.com/patternfly/patternfly-elements/commit/eb74cb8f989048164fbb6ed1508c502659a752ed) feat: add event emission to pfe-select
-- [](https://github.com/patternfly/patternfly-elements/commit/) fix: Add a warning about updating the on attribute before upgrade
+- [f9c2813](https://github.com/patternfly/patternfly-elements/commit/f9c2813892eace5e600d168d876ecc4ffd46b472) fix: Add a warning about updating the on attribute before upgrade
+- [](https://github.com/patternfly/patternfly-elements/commit/) fix: pfe-tabs history in Firefox, focus-state
 
 ## Prerelease 44 ( 2020-04-02 )