update dep:lockable (#30)

Author: jupe

setup.py

@@ -53,7 +53,7 @@
     python_requires='>=3.7, <4',
     install_requires=[
         'pytest',
-        'lockable>=0.8.0,<0.9.0'
+        'lockable>=0.9.0,<0.10.0'
     ],
     extras_require={  # Optional
         'dev': ['pynose', 'coveralls', 'pylint', 'coverage'],