Update meta.yaml

Update meta.yaml

Update changelog.rst

30-12-2020 3

major update: new imdpune link, cf-convention, new data handling, to_…

…geotiff

Update setup.py

enhancement of input arguments for imd.get_data() and imd.open_data().

 - get_data(var_type, start_yr, end_yr=None, fn_format=None, file_dir=None, sub_dir=False, proxies=None)

 - open_data(var_type, start_yr, end_yr=None, fn_format=None, file_dir=None)

 - Now if only one year is given then it can be treated as a single year.

deleting unwanted code

correction for multiple year