Kotlin: Add 1.7.0 RC

Author: igfoo

java/kotlin-extractor/kotlin_plugin_versions.py

@@ -19,7 +19,7 @@ def version_string_to_tuple(version):
     m = re.match(r'([0-9]+)\.([0-9]+)\.([0-9]+)', version)
     return tuple([int(m.group(i)) for i in range(1, 4)])
 
-many_versions = [ '1.4.32', '1.5.0', '1.5.10', '1.5.21', '1.5.31', '1.6.10', '1.6.20' ]
+many_versions = [ '1.4.32', '1.5.0', '1.5.10', '1.5.21', '1.5.31', '1.6.10', '1.7.0-RC', '1.6.20' ]
 
 many_versions_tuples = [version_string_to_tuple(v) for v in many_versions]