Dev for 0.8.1; update pyproject.toml

pyproject.toml

@@ -4,14 +4,14 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "plusminus"
-version = "0.8.0"
+version = "0.8.1"
 authors = [
   { name="Paul McGuire", email="[email protected]" },
 ]
 description = "+/- plusminus is a module that builds on the pyparsing infixNotation helper method to build easy-to-code and easy-to-use parsers for parsing and evaluating infix arithmetic expressions. plusminus's ArithmeticParser class includes separate parse and evaluate methods, handling operator precedence, override with parentheses, presence or absence of whitespace, built-in functions, and pre-defined and user-defined variables, functions, and operators."
 
 readme = "README.md"
-requires-python = ">=3.6"
+requires-python = ">=3.7"
 dependencies = [
   "pyparsing>=2.4.7",
 ]