v1.2.5

+ Allow plus/minus operators to be used as modifiers

v1.2.4

~ Fixed typos in the parsing regex to allow the parsing of negative numbers

+ Allow expression to start with a + or - sign

~ Downgraded java to 8 (no breaking changes)

+ Allow function call with no parameter

~ Fixed incorrect order of operation
+ Made missing operator check say it is so when it fails
~ Fixed inproper matching of parentheses