Bump version to 0.68.2 and prepare for release

changelog.md

+## 0.68.2
+
+ - Support GHC 8.2.1
+
+ - Make `hsc_alignment` macro work in clang
+   ([D3346](https://phabricator.haskell.org/D3346))
+
+ - Track column numbers to improve GHC's caret diagnostic display
+   ([#13388](https://ghc.haskell.org/trac/ghc/ticket/13388))
+
 ## 0.68.1
 
  - Fix type signature of generated `main` test function
@@ -6,4 +16,3 @@
 
  - Double-escape paths used to build call to `hsc_line`
    ([#12504](http://ghc.haskell.org/ticket/12504))
-

hsc2hs.cabal

 Name: hsc2hs
-Version: 0.68.1
+Version: 0.68.2
 Copyright: 2000, Marcin Kowalczyk
 License: BSD3
 License-File: LICENSE