Use Exception.message to retrieve error message

[martosaur]

While most of the time elixir errors have message field, this isn't a requirement. Good thing is that implementing message/1 callback is a requirement, so we can use Exception.message/1

[codecov]

Codecov Report

Base: 100.00% // Head: 100.00% // No change to project coverage 👍

Coverage data is based on head (c4ff1e9) compared to base (1ca7216).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff            @@
##            master        #9   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            9         9           
  Lines          114       114           
=========================================
  Hits           114       114           

Impacted Files	Coverage Δ
lib/hush/resolver.ex	100.00% <100.00%> (ø)
lib/hush/transformer.ex	100.00% <100.00%> (ø)
lib/hush/transformer/cast.ex	100.00% <100.00%> (ø)

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[gordalina]

Released in v1.0.2. Thank you!