Fix default copyright refs

[ardigan6]

Looks like a few files had an editor-default reference inserted. Updated them to agree with the overall project license for clarity. (CC @fjcaetano)

[codecov]

Codecov Report

Merging #114 (2e6b529) into master (0479b14) will decrease coverage by 1.83%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #114      +/-   ##
==========================================
- Coverage   97.80%   95.97%   -1.84%     
==========================================
  Files           8        8              
  Lines         273      273              
==========================================
- Hits          267      262       -5     
- Misses          6       11       +5     

Impacted Files	Coverage Δ
ReCaptcha/Classes/DispatchQueue+Throttle.swift	100.00% <ø> (ø)
ReCaptcha/Classes/ReCaptcha.swift	93.84% <ø> (ø)
ReCaptcha/Classes/ReCaptchaDecoder.swift	97.29% <ø> (ø)
ReCaptcha/Classes/ReCaptchaError.swift	73.91% <ø> (-21.74%)	⬇️
ReCaptcha/Classes/ReCaptchaResult.swift	100.00% <ø> (ø)
ReCaptcha/Classes/ReCaptchaWebViewManager.swift	100.00% <ø> (ø)
ReCaptcha/Classes/String+Dict.swift	100.00% <ø> (ø)

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