CI updates

.builds/msrv.yml

@@ -23,4 +23,4 @@ tasks:
       cargo build --all-features --verbose
       build2_exit=$?
 
-      exit $(( $fmt_exit || $build1_exit || $build2_exit ))
+      exit $(( $build1_exit || $build2_exit ))

.travis.yml

@@ -16,16 +16,8 @@ before_script:
       if [ "$TRAVIS_RUST_VERSION" != "1.36.0" ]; then
         rustup component add clippy
       fi
-  - |
-      if [ "$TRAVIS_RUST_VERSION" == "stable" ]; then
-        cargo install --force cargo-audit
-      fi
   - cargo generate-lockfile
 script:
-  - |
-      if [ "$TRAVIS_RUST_VERSION" == "stable" ]; then
-        cargo audit
-      fi
   - cargo fmt -- --check
   - |
       if [ "$TRAVIS_RUST_VERSION" != "1.36.0" ]; then