pass -v3 to cabal

Author: chessai

.travis.yml

@@ -110,8 +110,8 @@ install:
   - ${CABAL} v2-freeze $WITHCOMPILER ${TEST} ${BENCH} | color_cabal_output
   - "cat cabal.project.freeze | sed -E 's/^(constraints: *| *)//' | sed 's/any.//'"
   - rm  cabal.project.freeze
-  - ${CABAL} v2-build $WITHCOMPILER ${TEST} ${BENCH} --dep -j2 all | color_cabal_output
-  - ${CABAL} v2-build $WITHCOMPILER --disable-tests --disable-benchmarks --dep -j2 all | color_cabal_output
+  - ${CABAL} v2-build $WITHCOMPILER -v3 ${TEST} ${BENCH} --dep -j2 all | color_cabal_output
+  - ${CABAL} v2-build $WITHCOMPILER -v3 --disable-tests --disable-benchmarks --dep -j2 all | color_cabal_output
 script:
   - DISTDIR=$(mktemp -d /tmp/dist-test.XXXX)
   # Packaging...