Fix unable to check type warnings

[warn] /home/darius/dev/gerritforge/analytics/src/main/scala/com/googlesource/gerrit/plugins/analytics/common/CommitsStatisticsLoader.scala:107:28: The outer reference in this type test cannot be checked at run time.
[warn]   final private case class Replacer(pattern: Regex, replaced: String)
[warn]                            ^
[warn] /home/darius/dev/gerritforge/analytics/src/main/scala/com/googlesource/gerrit/plugins/analytics/common/CommitsStatisticsLoader.scala:109:28: The outer reference in this type test cannot be checked at run time.
[warn]   final private case class Lines(deleted: Int, added: Int) {
[warn]                            ^

Change-Id: I715010f48d74d8caaaf667699efc029cabef66b0
diff --git a/src/main/scala/com/googlesource/gerrit/plugins/analytics/common/CommitsStatisticsLoader.scala b/src/main/scala/com/googlesource/gerrit/plugins/analytics/common/CommitsStatisticsLoader.scala
index c9478b2..782eb44 100644
--- a/src/main/scala/com/googlesource/gerrit/plugins/analytics/common/CommitsStatisticsLoader.scala
+++ b/src/main/scala/com/googlesource/gerrit/plugins/analytics/common/CommitsStatisticsLoader.scala
@@ -38,6 +38,7 @@
   config: AnalyticsConfig,
   ignoreFileSuffixFilter: IgnoreFileSuffixFilter
 ) extends CacheLoader[CommitsStatisticsCacheKey, CommitsStatistics] {
+  import CommitsStatisticsLoader._
 
   override def load(cacheKey: CommitsStatisticsCacheKey): CommitsStatistics = {
     import RevisionBrowsingSupport._
@@ -101,9 +102,9 @@
             IssueInfo(code, transformed)
           })
     }
+}
 
-
-
+object CommitsStatisticsLoader {
   final private case class Replacer(pattern: Regex, replaced: String)
 
   final private case class Lines(deleted: Int, added: Int) {