Addresses #468 Added bing news search

[Remorax]

Addresses #468

Checklist

• [x] I have read the Contribution & Best practices Guide and my PR follows them.
• [x] My branch is up-to-date with the Upstream master branch.
• [x] I have added necessary documentation (if appropriate)

Changes proposed in this pull request:

• Bing news search has been added.
• I've used the refactored code of #479 while adding this feature so as to not have more redundant code

Link: https://evening-eyrie-95749.herokuapp.com/

@vaibhavsingh97 @ParthS007 @realslimshanky Please review 😄

[codecov[bot]]

Codecov Report

Merging #489 into master will increase coverage by 8.36%. The diff coverage is 90.32%.

@@            Coverage Diff             @@
##           master     #489      +/-   ##
==========================================
+ Coverage   82.54%   90.91%   +8.36%     
==========================================
  Files          29       29              
  Lines         957      881      -76     
==========================================
+ Hits          790      801      +11     
+ Misses        167       80      -87

Impacted Files	Coverage Δ
app/scrapers/__init__.py	96% <ø> (+13.14%)	:arrow_up:
app/scrapers/bing.py	100% <100%> (ø)	:arrow_up:
test/test_bing.py	100% <100%> (ø)	:arrow_up:
app/scrapers/generalized.py	87.09% <72.72%> (+48.74%)	:arrow_up:

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[Remorax]

@ParthS007 I've resolved the merge conflicts but I did it using the GUI so can the latest commit be merged?

[Remorax]

@bhaveshAn The link has been updated. Please check now.

[bhaveshAn]

I mean response is same whether I go for General search or News search. Just search for any keyword for General search and News search. You will get the same results. Go through these get requests and see the differences, if any. (No difference) General search : https://infinite-scrubland-15160.herokuapp.com/api/v1/search/bing?query=google&qtype=general&format=json News search : https://infinite-scrubland-15160.herokuapp.com/api/v1/search/bing?query=google&qtype=news&format=json