Fix composer2 warnings about version constraints and license identifier #8
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Composer complains "LGPL" is not a valid license identifier anymore.
Analysis of links and remarks in pear website and source code provide ambiguity if it is strictly licensed as LGPL-2.1 or LGPL-2.1 and later as some links point to LGPL-3 while the code says 2.1.
Composer also complained about unbounded (*) version for PEAR_Exception. As only one major revision ever existed and no new one is likely to follow I decided to convert it to ^1 (Version 1 and all minor and bugfix versions inside it)