fix invalid python name

[koxudaxi]

This PR fixes invalid python name (replace - with _)

• module-name
• class name
• field name( use alias)

Also, The PR converts a non-camel-case class name to UpperCamel.

Related Issues

#131

[codecov]

Codecov Report

Merging #132 into master will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master      #132   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           12        12           
  Lines          832       846   +14     
  Branches       173       174    +1     
=========================================
+ Hits           832       846   +14     

Impacted Files	Coverage Δ
datamodel_code_generator/parser/base.py	100.00% <100.00%> (ø)
datamodel_code_generator/parser/jsonschema.py	100.00% <100.00%> (ø)

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