Build failed in Xcode 10.1

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``` Cycle inside MacDown; building could produce unreliable results.
Cycle details:
→ That command depends on command in Target 'MacDown': script phase “[CP] Embed Pods Frameworks”
→ Target 'MacDown' has copy command from '/Users/brian.tully/Library/Developer/Xcode/DerivedData/MacDown-gxwdfssocsvkvufuhhdvwuydzcpv/Build/Products/Debug/macdown' to '/Users/brian.tully/Library/Developer/Xcode/DerivedData/MacDown-gxwdfssocsvkvufuhhdvwuydzcpv/Build/Products/Debug/MacDown.app/Contents/SharedSupport/bin/macdown'
○ Target 'MacDown' has compile command with input '/Users/brian.tully/Sites/macdown/MacDown/Images.xcassets'
○ That command depends on command in Target 'MacDown': script phase “[CP] Copy Pods Resources”
```

The report is limited to an Xcode 10.1 build log for target MacDown; begin by reproducing the build and inspect the “[CP] Embed Pods Frameworks” and “[CP] Copy Pods Resources” phases named in the cycle. Done means the MacDown target builds without the reported dependency cycle or unreliable-results warning.

Written by the indexing model from the issue text.