Apply clang-format for source files

Author: sea5kg

CHANGELOG.md

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+
+# wsjcpp-validators Changelog
+
+## [v0.1.3]
+
+- Updated years in license
+- Added license comment to source files
+- Apply clang format for source code

run_clang_format.sh

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+#!/bin/bash
+
+clang-format -style=file -i src/wsjcpp_validators.h
+clang-format -style=file -i src/wsjcpp_validators.cpp