Fixed crash on static calls on variables

• #13 Fixed crash on static calls on variables like $enum::getValues() thanks to @pascalheidmann

Support for PHPStan 1.0

#9, #11, #12 Added support for PHPStan 1.0 and dropped support for earlier releases thanks @ondrejmirtes

Added support for PHP-8

#7, #8 Added support for PHP-8

fixed return type detection of [self|static]::getValues()

#4 #5 fixed return type detection of [self|static]::getValues()

Support return type detection for Enum::getValues()

Detect possible return types of static call Enum::getValues()

v1.1.0 - Dynamic return type detection of Enum->getValue() & Enum->getValues()

Added dynamic return type detection for Enum->getValue() & Enum->getValues().

• detect return type of getValue()/getValues() of an enumeration by defined enumerators
  • If possible it also detects constant return values
• support union of multiple enumerations
  • like the values of a union of IntEnum|StrEnum will be a union of int|string

v1.0.0 - First working release

Support detection of Enum::CONST() accessor methods including:

• return type declaration
• deprecation detection from @deprecated annotation of constant