update stack dependencies

travis-stack.yaml

@@ -20,10 +20,11 @@ packages:
 
 # Packages to be pulled from upstream that are not in the resolver (e.g., acme-missiles-0.3)
 extra-deps:
-  - linear-1.20.2 # types of inverse functions changed in 1.20
+  - linear-1.20.5 # types of inverse functions changed in 1.20
   - vector-0.11.0.0 # required for latest linear
   - texrunner-0.0.1.0      # not yet in Stackage
   - svg-builder-0.1.0.1    # not yet in Stackage
+  - haskell-src-exts-simple-1.18.0.1.1
 
 # Override default flag values for local packages and extra-deps
 flags: