Bump gradle-scalafmt version

[p-jonghyun]

gradle-scalafmt:1.5.0 was not reachable for about a week while any other tags were accessible.
( https://plugins.gradle.org/m2/gradle/plugin/cz/alenkacz/gradle-scalafmt/1.5.0)

We will not be able to do any gradlew command without any changes.

./gradlew clean --refresh-dependencies
Build using Scala 2.12

FAILURE: Build failed with an exception.

* What went wrong:
A problem occurred configuring root project 'openwhisk'.
> Could not resolve all artifacts for configuration ':classpath'.
   > Could not find gradle.plugin.cz.alenkacz:gradle-scalafmt:1.5.0.
     Searched in the following locations:
       - https://jcenter.bintray.com/gradle/plugin/cz/alenkacz/gradle-scalafmt/1.5.0/gradle-scalafmt-1.5.0.pom
       - https://plugins.gradle.org/m2/gradle/plugin/cz/alenkacz/gradle-scalafmt/1.5.0/gradle-scalafmt-1.5.0.pom
     Required by:
         project :

[Suraez]

i am having the same issue

[style95]

I think this is addressed by this pull request.

[Suraez]

i got another issue now, when i made the changes stated in the above pull request

* What went wrong:
A problem occurred configuring project ':core:standalone'.
> Could not resolve all artifacts for configuration ':core:standalone:classpath'.
   > Could not find org.ajoberstar.grgit:grgit-core:3.0.0.
     Searched in the following locations:
       - https://plugins.gradle.org/m2/org/ajoberstar/grgit/grgit-core/3.0.0/grgit-core-3.0.0.pom
     Required by:
         project :core:standalone > com.gorylenko.gradle-git-properties:com.gorylenko.gradle-git-properties.gradle.plugin:2.0.0 > gradle.plugin.com.gorylenko.gradle-git-properties:gradle-git-properties:2.0.0