Fix namespacing / priority ordering

[vishalkuo]

Addresses #173

[codecov]

Codecov Report

Merging #176 (0866a33) into master (5f307de) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #176   +/-   ##
=======================================
  Coverage   99.65%   99.65%           
=======================================
  Files          10       10           
  Lines         869      869           
  Branches      151      151           
=======================================
  Hits          866      866           
  Misses          2        2           
  Partials        1        1           

Impacted Files	Coverage Δ
dataclasses_avroschema/fields.py	99.56% <100.00%> (ø)

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[marcosschroh]

Thanks @vishalkuo