GHC 8.6 support

Author: ameingast

.travis.yml

@@ -10,6 +10,7 @@ env:
  - CABALVER=1.24 GHCVER=8.0.2
  - CABALVER=2.0 GHCVER=8.2.2
  - CABALVER=2.2 GHCVER=8.4.3
+ - CABALVER=2.4 GHCVER=8.6.4
 
 before_install:
  - travis_retry sudo add-apt-repository -y ppa:hvr/ghc

postgresql-simple-migration.cabal

@@ -63,6 +63,7 @@ Executable migrate
 test-suite tests
     main-is:                Main.hs
     hs-source-dirs:         test
+    other-modules:          Database.PostgreSQL.Simple.MigrationTest
     ghc-options:            -Wall -fwarn-tabs -fwarn-incomplete-uni-patterns
     default-extensions:     OverloadedStrings, CPP, LambdaCase
     default-language:       Haskell2010