Fix wrong BigInteger size

generator/src/main/java/io/github/lonamiwebs/overgram/parser/TLArg.java

@@ -161,9 +161,9 @@ public class TLArg {
     public int bigIntSize() {
         switch (types.get(types.size() - 1)) {
             case "int128":
-                return 32;
+                return 16;
             case "int256":
-                return 64;
+                return 32;
             default:
                 return 0;
         }

lib/src/main/java/io/github/lonamiwebs/overgram/crypto/Authenticator.java

@@ -57,7 +57,6 @@ public class Authenticator {
             throw new SecurityException("Step 2 could not find a known RSA key");
         }
 
-        // TODO This *sometimes* fails, huh
         final Abstract.ServerDHParams abstractDhParams = sender.send(
                 new Functions.ReqDHParams()
                         .nonce(resPq.nonce())