1.6.0

Total issues resolved: 24

• 209: PHPStan v1.0 thanks to @t0mmy742
• 210: Update phpstan/phpstan requirement from ^1.0 to ^1.2 thanks to @dependabot[bot]
• 211: Drop Support for PHP 7.3 thanks to @nbayramberdiyev
• 212: Update phpspec/prophecy requirement from ^1.14 to ^1.15 thanks to @dependabot[bot]
• 213: Update phpstan/phpstan requirement from ^1.2 to ^1.3 thanks to @dependabot[bot]
• 214: Correct min. PHP version in README thanks to @nbayramberdiyev
• 216: Update phpstan/phpstan requirement from ^1.3 to ^1.4 thanks to @dependabot[bot]
• 217: Update symfony/polyfill-php80 requirement from ^1.23 to ^1.24 thanks to @dependabot[bot]
• 251: Avoid falsy comparison thanks to @nbayramberdiyev
• 252: Replace setMethods with addMethods thanks to @nbayramberdiyev
• 253: Minor improvements thanks to @nbayramberdiyev
• 254: Replace assertFileNotExists() method thanks to @nbayramberdiyev
• 255: Fix incorrect readable check thanks to @nbayramberdiyev
• 256: Encode special characters thanks to @nbayramberdiyev
• 258: Update symfony/polyfill-php80 requirement from ^1.24 to ^1.25 thanks to @dependabot[bot]
• 259: Update phpstan/phpstan requirement from ^1.4 to ^1.5 thanks to @dependabot[bot]
• 260: Update adriansuter/php-autoload-override requirement from ^1.2 to ^1.3 thanks to @dependabot[bot]
• 261: Explicitly specify with phpdoc return types from interface thanks to @andrew-demb
• 263: Update phpstan/phpstan requirement from ^1.5 to ^1.6 thanks to @dependabot[bot]
• 264: Cast header name to string thanks to @nbayramberdiyev
• 265: Update phpstan/phpstan requirement from ^1.6 to ^1.7 thanks to @dependabot[bot]
• 266: Update symfony/polyfill-php80 requirement from ^1.25 to ^1.26 thanks to @dependabot[bot]
• 267: Update phpstan/phpstan requirement from ^1.7 to ^1.8 thanks to @dependabot[bot]
• 268: Update squizlabs/php_codesniffer requirement from ^3.6 to ^3.7 thanks to @dependabot[bot]