Update SUMMARY.md

Author: gadilashashank

book/SUMMARY.md

@@ -55,6 +55,22 @@
 
   * [Conclusion](languages/python/conclusion.md)
 
+* [Erlang](languages/erlang/README.md)
+
+  * [Introduction](languages/erlang/intro.md)
+
+  * [History](languages/erlang/history.md)
+
+  * [Advantages](languages/erlang/advantages.md)
+
+  * [Disadvantages](languages/erlang/disadvantages.md)
+
+  * [Some interesting facts](languages/erlang/misc.md)
+
+  * [Conclusion](languages/erlang/conclusion.md)
+
+
+
 * [JavaScript](languages/js/README.md)
 
   * [Introduction](languages/js/intro.md)
@@ -95,20 +111,6 @@
 
   * [Conclusion](languages/golang/conclusion.md)
 
-* [Erlang](languages/erlang/README.md)
-
-  * [Introduction](languages/erlang/intro.md)
-
-  * [History](languages/erlang/history.md)
-
-  * [Advantages](languages/erlang/advantages.md)
-
-  * [Disadvantages](languages/erlang/disadvantages.md)
-
-  * [Some interesting facts](languages/erlang/misc.md)
-
-  * [Conclusion](languages/erlang/conclusion.md)
-
 ## End
 
 * [Credits](credits.md)