bump libyang version to 2.37

Author: tbsuht

setup.py

@@ -158,7 +158,7 @@ def make_release_tree(self, base_dir, files):
         'cffi; platform_python_implementation != "PyPy"',
     ],
     install_requires=[
-        "libyang>=2.1",
+        "libyang>=2.37",
         'cffi; platform_python_implementation != "PyPy"',
     ],
     cffi_modules=["cffi/build.py:BUILDER"],