Bump hardcoded version to prevent issues with version recognition by …

…IDE (#74)

gradle.properties

@@ -3,7 +3,7 @@
 pluginGroup=com.sourcegraph.jetbrains
 pluginName=Sourcegraph
 # SemVer format -> https://semver.org
-pluginVersion=5.2.1715-nightly
+pluginVersion=6.0-localbuild
 # See https://plugins.jetbrains.com/docs/intellij/build-number-ranges.html
 # for insight into build numbers and IntelliJ Platform versions.
 pluginSinceBuild=221.1