Version 2.0.3

• Change LanguagePackUpgrader::download_package signature [#82]
• Implement CS checking based on the WP_CLI_CS ruleset [#80]
• PHPCS: fix up the code base [4] - multi-line function calls [#79]
• PHPCS: fix up the code base [3] - prefix global variables [#78]
• PHPCS: fix up the code base [2] - strict comparisons [#77]
• QA: abstract a 3x duplicate closure to a function [#76]
• PHPCS: fix up the code base [1] - various small fixes [#75]
• Enhancement: Add PHP 7.3 to Travis CI build matrix [#74]
• Move PHP 5.4 tests from WP_VERSION latest to 5.1 [#72]