Change method names from **convert to convert_**type

[putianyi889]

Closes #26

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 73.68421% with 5 lines in your changes missing coverage. Please review.

Project coverage is 68.85%. Comparing base (170cbd9) to head (e6d1dab).

Files with missing lines	Patch %	Lines
src/EltypeExtensions.jl	73.68%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #27      +/-   ##
==========================================
+ Coverage   68.33%   68.85%   +0.51%     
==========================================
  Files           1        1              
  Lines          60       61       +1     
==========================================
+ Hits           41       42       +1     
  Misses         19       19              

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