Add trailing backslashes at end of line consistently

ruby/travis-test.sh

@@ -14,9 +14,9 @@ test_version() {
        which ruby && \
        git clean -f && \
        gem install --no-document bundler && bundle && \
-       rake test &&
+       rake test && \
-       rake gc_test &&
+       rake gc_test && \
-       cd ../conformance && make test_jruby &&
+       cd ../conformance && make test_jruby && \
        cd ../ruby/compatibility_tests/v3.0.0 && ./test.sh"
   else
     bash --login -c \
@@ -24,10 +24,10 @@ test_version() {
        which ruby && \
        git clean -f && \
        gem install --no-document bundler -v 1.17.3 && bundle && \
-       rake test &&
+       rake test && \
-       rake gc_test &&
+       rake gc_test && \
-       cd ../conformance && make ${RUBY_CONFORMANCE} &&
+       cd ../conformance && make ${RUBY_CONFORMANCE} && \
-       cd ../ruby/compatibility_tests/v3.0.0 &&
+       cd ../ruby/compatibility_tests/v3.0.0 && \
        cp -R ../../lib lib && ./test.sh"
   fi
 }