bump version, add changelog

ChangeLog.md

 # Changelog for tahoe-lafs-immutable-uploader
 
-## 0.1.0
+## 0.1.0.1
+
+* Switch from `base64` to `base64-bytestring` to avoid an encoding bug on ARM
+  with GHC 8.6.5.
+
+## 0.1.0.0
 
 * Initial release.
-* Support for encoding data using Tahoe-LAFS' CHK protocol.
+* Support for encoding and decoding data using Tahoe-LAFS' CHK protocol.

tahoe-chk.cabal

 cabal-version:      1.12
 name:               tahoe-chk
-version:            0.1.0.0
+version:            0.1.0.1
 synopsis:
   The Tahoe-LAFS' Content-Hash-Key (CHK) cryptographic protocol.