Handle components/subcomponents within hl7version field (MSH-12)

[pcorrick]

When the MSH-12 field (HL7 version) has components, getField(12) returns an array which causes a type error with $this->hl7Version (which is a string)

[senaranya]

Please add test(s) that'd fail without the fix

[pcorrick]

Please add test(s) that'd fail without the fix

Sure, I gave it a go

[senaranya]

Thank you for the test. Can you please replace the reflection though (as the implementation of the Message class may change in future). May be to this:

$msg = new Message("MSH|^~\\&||||||||||2.7^NZL&1.0\r");
self::assertSame("MSH|^~\&||||||||||2.7^NZL&1.0|\n", $msg->toString(true));

Also, a stray phpunit cache file got pushed in the commit, please remove it.

[pcorrick]

ok thanks I have made those adjustments

[senaranya]

Merged. Thank you for the fix and the PR. Appreciate your help :)