Update CachingTransformer.java

src/main/java/io/gitlab/jfronny/translater/CachingTransformer.java

@@ -37,6 +37,13 @@ public abstract class CachingTransformer implements StringTransformer {
                     }
                 }
             }
+            try {
+                FileOutputStream outS = new FileOutputStream(cacheFile);
+                cache.store(outS, "---Lang---");
+                outS.close();
+            } catch (IOException e) {
+                e.printStackTrace();
+            }
         }
         if (!cache.containsKey(str)) {
             cache.put(str, getTransformed(str));