Implemented feature to get quarterly and annual financial data of stock

[dhruvin-084]

Function getFinancialData returns list of dictionaries, which contains various financial data such as Revenue, OtherIncome, TotalIncome, Expenditure, Interest, PBDT, Depreciation, PBT, Tax, NetProfit, Equity, EPS, CEPS, OPM, NPM from last five quarter or last five years.

Please review it and let me know if any thing else can be added or improved.

[codecov]

Codecov Report

Merging #29 (47f9266) into master (4f5f313) will decrease coverage by 7.42%.
The diff coverage is 15.55%.

@@            Coverage Diff             @@
##           master      #29      +/-   ##
==========================================
- Coverage   65.26%   57.84%   -7.43%     
==========================================
  Files           8        9       +1     
  Lines         262      306      +44     
==========================================
+ Hits          171      177       +6     
- Misses         91      129      +38     

Impacted Files	Coverage Δ
bsedata/financialData.py	11.90% <11.90%> (ø)
bsedata/bse.py	90.69% <66.66%> (-1.99%)	⬇️

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[sdabhi23]

BSE India has increased the security on it's APIs and this way of fetching data no longer works