Added

• Support 4.1 as a version option.
• Add equal_loc to CallNode.
• Add len()/is_empty() to ConstantList and NodeList in the Rust API.

Changed

• Rename version 3.5 to version 4.0.
• Fix compiling the gem from source on Windows.
• Fix parsing of unary method calls like 42.~@.
• Reject def f a, (b) = 1.
• Reject endless method as a block parameter default.
• Reject variable capture in alternative pattern.
• Many fixes in regards to memory safety, found through fuzzing.
• Many fixes to better handle invalid syntax, also found through fuzzing.
• Fix the ruby version used by the ripper translator.
• Fix ruby_parser translation comment processing.