Log Message:
Update to 0.6.1.0

changelog.md:
## Changes in version 0.6.1.0

 * Use more appropriate types in internal memset functions, which prevents
   overflows/segfaults on 64-bit systems.

 * Fixed a warning on GHC 7.10

 * Worked around a -dcore-lint bug in GHC 7.6/7.7

## Changes in version 0.6

 * Split PrimMonad into two classes to allow automatic lifting of primitive
   operations into monad transformers. The `internal` operation has moved to the
   `PrimBase` class.

 * Fixed the test suite on older GHCs