count() error

[mightymango]

I'm using version 1.5 but am getting the error below.

Mar 18 13:05:40 the-spellbots-worker app/worker.1: A PHP Error was encountered 
Mar 18 13:05:40 the-spellbots-worker app/worker.1: Severity:    Warning 
Mar 18 13:05:40 the-spellbots-worker app/worker.1: Message:     count(): Parameter must be an array or an object that implements Countable 
Mar 18 13:05:40 the-spellbots-worker app/worker.1: Filename:    /app/vendor/guzzlehttp/guzzle/src/Handler/CurlFactory.php 
Mar 18 13:05:40 the-spellbots-worker app/worker.1: Line Number: 67 

This error appears to be fixed in v6.3 but the php client uses <6.3

guzzle/guzzle#1973

[ginc]

Any reason you want to keep guzzle below 6.3? Any plans to drop the constraint?