Update release date

Author: andersfugmann

Changelog

@@ -3,12 +3,12 @@
 Changes marked with '*' indicates a changes that breaks backward compatibility
 [ ] Support extensible polymorphic variants
 
-5.0.0 (unreleased)
+5.0.0 (2019-04-19)
 [x] Add option make make lazy type indeed lazy
 [x] Add option to mangle variant names
 [*] Refactor tuple, variant and record code to be more efficient
 [x] Reduce amount of closures in generated code
-[x] support nativeint
+[*] support nativeint
 [x] Remove superfluous rec flag from generated code
 [x] Cache partial results for recursive types
 [x] Fix signatures for parameterized types
@@ -19,6 +19,7 @@ Changes marked with '*' indicates a changes that breaks backward compatibility
 [x] Add a TLDR to the README, including dune build instructions
 [x] Allow core < v.013
 [x] Switch to use alcotest
+[x] Expose constructor to driver error type for custom parsers. (@paurkedal)
 
 4.0.0 (released 2019-03-26)
 [*] Support "@default" argument on record fields. #9