Fix pypy run (#81)

Author: skshetry

.github/workflows/tests.yml

@@ -25,7 +25,7 @@ jobs:
         pyv: ['3.8', '3.9', '3.10']
         include:
         - os: ubuntu-latest
-          pyv: 'pypy-3.8'
+          pyv: 'pypy3.8'
 
     steps:
     - name: Check out the repository

noxfile.py

@@ -9,7 +9,7 @@
 locations = "src", "tests"
 
 
-@nox.session(python=["3.8", "3.9", "3.10", "pypy-3.8", "pypy-3.9"])
+@nox.session(python=["3.8", "3.9", "3.10", "pypy3.8", "pypy3.9"])
 def tests(session: nox.Session) -> None:
     session.install(".[tests]")
     session.run(