Fix integration test 3607-stack-init-solver

Author: borsboom

test/integration/tests/3607-stack-init-solver/Main.hs

@@ -2,5 +2,7 @@ import StackTest
 
 main :: IO ()
 main = do
-  stack ["init", "--resolver", "nightly-2018-07-31", "--solver", "--force"]
+  -- The resolver specified should be a nightly with a GHC version that matches
+  -- the LTS resolver used in Stack's top-level `stack.yaml`.
+  stack ["init", "--resolver", "nightly-2018-03-12", "--solver", "--force"]
   stack ["build"]