title: ERROR | [iOS] file patterns: The `source_files` pattern did not match any file
body: <p>I renamed my Existing library to github, I changed everything and things are working fine apart from it's not validating my library now by - pod spec lint KJCircularSlider.podspec for trunk push. I checked my folder structure and it looks perfect, anyone can help me what can be the actual issue?<br>
  Here is my library if you want to check folder structure - <a href="https://github.com/KiranJasvanee/KJCircularSlider" rel="noreferrer">KJCircularSlider</a></p>
  
  <p>Here is my podspec file.  </p>
  
  <pre><code>Pod::Spec.new do |s|
    s.name             = 'KJCircularSlider'
    s.version          = '0.1.0'
    s.summary          = 'Circular slider - to slide from 0 to 100 in circular shape'
  
  # This description is used to generate tags and improve search results.
  #   * Think: What does it do? Why did you write it? What is the focus?
  #   * Try to keep it short, snappy and to the point.
  #   * Write the description between the DESC delimiters below.
  #   * Finally, don't worry about the indent, CocoaPods strips it!
  
    s.description      = &lt;&lt;-DESC
  TODO: Add long description of the pod here.
  It's circular slider, It provides circular shape to slide around from 0 to 100 percent, You can use it when you required a circular shape on slider rather than traditional iOS line shape slider.
                         DESC
  
    s.homepage         = 'https://github.com/KiranJasvanee/KJCircularSlider'
    # s.screenshots     = 'www.example.com/screenshots_1', 'www.example.com/screenshots_2'
    s.license          = { :type =&gt; 'MIT', :file =&gt; 'LICENSE' }
    s.author           = { 'Kiran Jasvanee' =&gt; 'kiran.jasvanee@yahoo.com' }
    s.source           = { :git =&gt; 'https://github.com/KiranJasvanee/KJCircularSlider.git', :tag =&gt; s.version.to_s }
    # s.social_media_url = 'https://twitter.com/KiranJasvanee'
  
    s.ios.deployment_target = '9.0'
  
    s.source_files = 'Classes/**/*'
  
    # s.resource_bundles = {
    #   'KJCircularSlider' =&gt; ['KJCircularSlider/Assets/*.png']
    # }
  
    # s.public_header_files = 'Pod/Classes/**/*.h'
    # s.frameworks = 'UIKit', 'MapKit'
    # s.dependency 'AFNetworking', '~&gt; 2.3'
  end
  </code></pre>