title: Podspec Error: The `source_files` pattern did not match any file
body: <p>I am creating cocoa pod test library. I added podspec file to it as </p>
  
  <pre><code>Pod::Spec.new do |s|
    s.name         = "TestFrame"
    s.version      = "0.0.1"
    s.summary      = "A short description of TestFrame."
    s.homepage     = "https://github.com/{user}/{project}"
    s.license      = { :type =&gt; "MIT", :file =&gt; "LICENSE" }
    s.author                = { "Shubham" =&gt; "{email}" }
    s.ios.deployment_target = "10.0"
    s.swift_version         = "4.2"
    s.source       = { :git =&gt; "https://github.com/{User}/{project}.git", :tag =&gt; "#{s.version}" }
    s.source_files = "TestFrame.h", "Test.swift"
  end
  </code></pre>
  
  <p>When I do <code>pod lib lint --allow-warnings</code> validation gets success but when I do <code>pod trunk push --allow-warnings</code> I get validation error </p>
  
  <pre><code>- ERROR | [iOS] file patterns: The `source_files` pattern did not match any file.
  </code></pre>
  
  <p>I tried many combinations randomly for <code>s.source_files</code> but many a times I get above error.</p>
  
  <p>My project structure</p>
  
  <pre><code>--TestFrame
    --TestFrame
      --TestFrame.h
      --Test.swift
      --Info.plist
  </code></pre>
  
  <p>My problem is I don't know what to write in as <code>source_files</code>.</p>