+0.4.3 Oct 28, 2015:
+ o self-repair the keyring if keys get duplicated. Closes: #7498
+ o catch request exceptions on key fetching. Closes #7410.
+ o Don't repush a public key with different addres
+ o use async events api. Closes #7224.
+ o Use ca_bundle when fetching keys by url.
+ o add logging to fetch_key. Related: #7410.
+ o more verbosity in get_key wrong address log.
+ o don't repush a public key with different address. Related #7420.
+
0.4.2 Aug 26, 2015:
o Style changes.
o Tests updates.