release constraint pandas>=1.2.2 to 1.1.5 to be compatible with python3.6

cfelpyutils/__init__.py

@@ -17,4 +17,4 @@ This is the CFELPyUtils package, which contains all modules of the library.
 
 Please refer to the individual modules to learn more about their function.
 """
-__version__ = "2.0.4"
+__version__ = "2.0.5"

requirements.txt

@@ -8,7 +8,7 @@ m2r2>=0.2.7
 mypy-extensions>=0.4.3
 mypy>=0.812
 numpy>=1.16.4
-pandas>=1.2.2
+pandas>=1.1.5
 pylint-gitlab>=0.2
 pylint>=2.7
 pytest-cov>=2.11