Added version info and the getVersion() for it #10
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This adds a version property to Connection.php and a getVersion() to go with it.
I chose Connection.php as it is the most central location. I preferred not to introduce another file just for the version info. However we also can do it this way.
We should have a version that one can use in order to be able to be able handle changes or new features between versions of the API.
For example issue #8 #8 changes the behavior and and some higher level function could break because of this.
With the version info one can query and react accordingly.
I set Version to 0.3.1 as the last I saw was 0.3.0 but I'll leave it to you to decide.