Update CHANGELOG with #238 fix

Prepare CHANGELOG for next fix release

Prepare CHANGELOG.md for next release

created tag 0.5.0

Update dependecies and coding style fixes

Update changelog and cs fixes

Prepare for next release

Increase iterations number in Backpropagation test (sometimes it fails)

Merge pull request #16 from php-ai/develop

Simple Neural Network with MultilayerPerceptron and Backpropagation

Merge pull request #12 from php-ai/develop

New features: ClassificationReport and FileDataset