Added py.typed

Author: Joel Collins

pyproject.toml

@@ -10,6 +10,7 @@ classifiers = [
     "Topic :: Software Development :: Libraries :: Application Frameworks",
     "Topic :: Internet :: WWW/HTTP :: WSGI"
 ]
+include = ["src/labthings/py.typed"]
 
 [tool.poetry.dependencies]
 python = "^3.6"
@@ -45,6 +46,5 @@ ensure_newline_before_comments = true
 line_length = 88
 
 [build-system]
-requires = ["poetry>=0.12"]
-build-backend = "poetry.masonry.api"
-
+requires = ["poetry-core>=1.0.0"]
+build-backend = "poetry.core.masonry.api"