upgrade pyyaml

setup.py

@@ -18,7 +18,7 @@
  license="GPLv3",
  description="This is lib50, CS50's own internal library used in many of its tools.",
  long_description="This is lib50, CS50's own internal library used in many of its tools.",
- install_requires=["attrs>=18.1,<21", "pexpect>=4.6,<5", "pyyaml>=3.10,<6", "requests>=2.13,<3", "termcolor>=1.1,<2", "jellyfish>=0.7,<1", "cryptography>=2.7"],
+ install_requires=["attrs>=18.1,<21", "pexpect>=4.6,<5", "pyyaml<7", "requests>=2.13,<3", "termcolor>=1.1,<2", "jellyfish>=0.7,<1", "cryptography>=2.7"],
  extras_require = {
  "develop": ["sphinx", "sphinx-autobuild", "sphinx_rtd_theme"]
  },
@@ -27,6 +27,6 @@
  python_requires=">= 3.6",
  packages=["lib50"],
  url="https://github.com/cs50/lib50",
- version="3.0.6",
+ version="3.0.7",
  include_package_data=True
 )