SPM support

[bguidolim]

[codecov[bot]]

Codecov Report

Merging #137 (7352327) into master (967d7d9) will not change coverage. The diff coverage is n/a.

@@            Coverage Diff             @@
##            master      #137    +/-   ##
==========================================
  Coverage   100.00%   100.00%            
==========================================
  Files           21        21            
  Lines         1003       857   -146     
==========================================
- Hits          1003       857   -146     

Impacted Files	Coverage Δ
Classes/Internal/String.swift	100.00% <0.00%> (ø)
Classes/MentionListener.swift	100.00% <0.00%> (ø)
Classes/Internal/Operators.swift	100.00% <0.00%> (ø)
Classes/Internal/MentionsArray.swift	100.00% <0.00%> (ø)
Classes/Internal/NSAttributedString.swift	100.00% <0.00%> (ø)
SZMentionsSwiftTests/DelegatesTests.swift	100.00% <0.00%> (ø)
SZMentionsSwiftTests/CreateMentionTests.swift	100.00% <0.00%> (ø)
SZMentionsSwiftTests/AddingMentionsTests.swift	100.00% <0.00%> (ø)
SZMentionsSwiftTests/MentionsDisplayTests.swift	100.00% <0.00%> (ø)
SZMentionsSwiftTests/AttributeContainerTests.swift	100.00% <0.00%> (ø)
... and 2 more

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[Gertjancom]

Can I vote for a merge please :) ?