Update CHANGELOG
Merge pull request phalcon#2234 from phalcon/1.3.1 1.3.1
Missing items in CHANGELOG
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Merge pull request phalcon#1812 from phalcon/1.2.5 1.2.5
Version 1.2.4 Stable
Version 1.2.3 Stable
Version 1.2.2 Stable
Version 1.2.1 Stable
Version 1.2.0 Stable