Updated error handlign

.travis.yml

@@ -12,7 +12,5 @@ addons:
     packages:
     - python3
 
-before_script:
-  - composer update --dev
 script:
   - ./testing.php

src/danog/MadelineProto/Session.php

@@ -184,7 +184,7 @@ Slv8kg9qv1m6XHVQY3PnEw+QQtqSIXklHwIDAQAB
         }
 
         if (fstat($payload)['size'] == 4) {
-            throw new Exception('Server response error: '.$this->struct->unpack('<I', fread($payload, 4))[0]);
+            throw new Exception('Server response error: '.abs($this->struct->unpack('<i', fread($payload, 4))[0]));
         }
         $auth_key_id = fread($payload, 8);
         if ($auth_key_id == Tools::string2bin('\x00\x00\x00\x00\x00\x00\x00\x00')) {
@@ -286,12 +286,15 @@ Slv8kg9qv1m6XHVQY3PnEw+QQtqSIXklHwIDAQAB
         $this->log->log('Starting Diffie Hellman key exchange');
 
         $server_dh_params = $this->method_call('req_DH_params', 
-            ['nonce' => $nonce,
+            [
+                'nonce' => $nonce,
                 'server_nonce' => $server_nonce,
                 'p' => $p_bytes,
                 'q' => $q_bytes,
                 'public_key_fingerprint' => $public_key_fingerprint,
-            'encrypted_data' => $encrypted_data]);
+                'encrypted_data' => $encrypted_data
+            ]
+        );
 
         if ($nonce != $server_dh_params['nonce']) {
             throw new Exception('Handshake: wrong nonce.');

src/danog/MadelineProto/TL/TL.php

@@ -98,7 +98,6 @@ class TL
                 if (!is_numeric($value)) {
                     throw new Exception("serialize_param: given value isn't numeric");
                 }
-
                 return \danog\PHP\Struct::pack('<q', $value);
                 break;
             case 'int128':