Added tickers_types

[PyDataBlog]

Added ticker_types func and tests

[codecov-commenter]

Codecov Report

Merging #2 (833e990) into master (e661808) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master        #2   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            2         2           
  Lines            8        14    +6     
=========================================
+ Hits             8        14    +6     

Impacted Files	Coverage Δ
src/reference_api.jl	100.00% <100.00%> (ø)

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