up attrs max version

Author: Kareem Zidane

setup.py

@@ -11,7 +11,7 @@
     ],
     license="GPLv3",
     description="This is compare50, with which you can compare files for similarities.",
-    install_requires=["attrs>=18,<19.2.0", "intervaltree>=2.1.0,<3", "lib50>=2,<4", "numpy>=1.15,<2", "pygments>=2.2,<3", "jinja2>=2.10,<3", "termcolor>=1.1.0,<2", "tqdm>=4.32,<5"],
+    install_requires=["attrs>=18,<21", "intervaltree>=2.1.0,<3", "lib50>=2,<4", "numpy>=1.15,<2", "pygments>=2.2,<3", "jinja2>=2.10,<3", "termcolor>=1.1.0,<2", "tqdm>=4.32,<5"],
     extras_require = {
         "develop": ["sphinx", "sphinx_rtd_theme", "line_profiler"]
     },
@@ -21,6 +21,6 @@
     packages=find_packages(exclude=["tests"]),
     scripts=["bin/compare50"],
     url="https://github.com/cs50/compare50",
-    version="1.2.0",
+    version="1.2.1",
     include_package_data=True,
 )