Modified examples, fixed top method error, and added tests

[abhinavk99]

• Added pprint to examples
• Replaced asyncio.coroutine with async/await syntax in async examples (no more 3.4 support)
• Added error if subtype given without page for top method
• Added tests to improve coverage

[abhinavk99]

For #32

[codecov-io]

Codecov Report

Merging #33 into master will increase coverage by 9.3%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##           master      #33     +/-   ##
=========================================
+ Coverage   85.92%   95.23%   +9.3%     
=========================================
  Files           6        6             
  Lines         334      336      +2     
=========================================
+ Hits          287      320     +33     
+ Misses         47       16     -31

Impacted Files	Coverage Δ
jikanpy/abstractjikan.py	90.58% <100%> (+17.96%)	⬆️
jikanpy/aiojikan.py	100% <0%> (+1.12%)	⬆️

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