Bump version to 4.18.7 in master-dist for npm publication

[dtaylor113]

Last PR for MIT licensing change didn't get published correctly, failed with:

+merge_prereqs
+echo *** This build is running against patternfly/angular-patternfly
*** This build is running against patternfly/angular-patternfly
+cd /home/travis/build/patternfly/angular-patternfly
+[ 767 != false -o -n  ]
+echo *** This build is running against a pull request or tag! Exiting...
*** This build is running against a pull request or tag! Exiting...
+exit 0
+check 0 Publish failure
+[ 0 != 0 ]
+check 0 Semantic release failure
+[ 0 != 0 ]
The command "sh -x ./node_modules/patternfly-eng-release/scripts/_build.sh -a" exited with 0.

Manually updating version.
Fixes #769