* Fixed escape characters: Go octal escapes take exactly three digits, hex escapes take exactly two digits, added Unicode escape characters
* Added the printf verbs %O and %F plus support the 1-indexing of arguments within fmt e.g. %[1]d
* Added support for Go 1.13's new integer literal syntaxes: 0b for binary, 0o/0O for octal, hex floating point literals like 0x1.fp-2, underscores between digits, and the imaginary suffix i which can now attach to any literal