Fix [FutureWarning: The frame.append method is deprecated and will be removed from pandas in a future version. Use pandas.concat instead.] (#247)

* Fix [FutureWarning: The frame.append method is deprecated and will be removed from pandas in a future version. Use pandas.concat instead.]

* updating pandas version

* adding axis=0 in pandas.concat() for more controlled behaviour

* updating Pipenv.lock file

Co-authored-by: Sujit Patel <sujit.patel@nurture.farm>

Author: psujit775

.gitignore

@@ -102,3 +102,6 @@ venv.bak/
 
 # mypy
 .mypy_cache/
+
+# pycharm
+.idea/

Pipfile

@@ -12,7 +12,7 @@ sphinx-rtd-theme = "*"
 [packages]
 requests = "*"
 dateparser = "*"
-pandas = ">=1.0.0"
+pandas = ">=1.4.0"
 matplotlib = "*"
 numpy = "*"