Use double pipes in composer dependency file (googleapis#1505)

use of single pipes is deprecated, see composer/composer#6755 (comment)

Author: Adam Silverstein

composer.json

@@ -9,10 +9,10 @@
         "php": ">=5.4",
         "google/auth": "^1.0",
         "google/apiclient-services": "~0.13",
-        "firebase/php-jwt": "~2.0|~3.0|~4.0|~5.0",
+        "firebase/php-jwt": "~2.0||~3.0||~4.0||~5.0",
         "monolog/monolog": "^1.17",
-        "phpseclib/phpseclib": "~0.3.10|~2.0",
-        "guzzlehttp/guzzle": "~5.3.1|~6.0",
+        "phpseclib/phpseclib": "~0.3.10||~2.0",
+        "guzzlehttp/guzzle": "~5.3.1||~6.0",
         "guzzlehttp/psr7": "^1.2"
     },
     "require-dev": {