chore: update opentracing-php to 1.0.1

[Rainrider]

This adds support for opentracing ^1.0. Since nothing really changed there since beta5 apart from type-hinting, strict typing and a minor exceptions refactoring (see opentracing/opentracing-php@1.0.0-beta5...1.0.1), I think nothing should be broken here as well (unless it has been like that already). There are two further API extensions in case those are of any interest here - new method GlobalTracer::isRegistered and StartSpanOptions::create now checks and sets ignore_active_span option.

Closes #54

[cawolf]

Hi @Rainrider,

thank you for your submission. I incorporated your work into #73 and released core in v1 today. We will continue upgrading the plugins asap.