reformat .travis.yml
reformat .travis.yml

afk11/secp256k1-php,afk11/secp256k1-php,afk11/secp256k1-php,afk11/secp256k1-php,Bit-Wasp/secp256k1-php,Bit-Wasp/secp256k1-php,afk11/secp256k1-php,Bit-Wasp/secp256k1-php,Bit-Wasp/secp256k1-php,Bit-Wasp/secp256k1-php