Use CocoaPods CDN introduced in 1.7.2

https://blog.cocoapods.org/CocoaPods-1.7.2/

Note that CDN became default since 1.8.0 so it's probably no longer
experimental.

Author: FranklinYu

Podfile

@@ -1,7 +1,7 @@
 platform :osx, "10.8"
 
 source 'https://github.com/MacDownApp/cocoapods-specs.git'  # Patched libraries.
-source 'https://github.com/CocoaPods/Specs.git'
+source 'https://cdn.cocoapods.org/'
 
 project 'MacDown.xcodeproj'
 

Podfile.lock

@@ -23,29 +23,29 @@ DEPENDENCIES:
   - Sparkle (~> 1.18)
 
 SPEC REPOS:
-  https://github.com/cocoapods/specs.git:
+  https://github.com/MacDownApp/cocoapods-specs.git:
+    - handlebars-objc
+    - hoedown
+    - LibYAML
+  trunk:
     - GBCli
     - JJPluralForm
-    - LibYAML
     - M13OrderedDictionary
     - MASPreferences
     - PAPreferences
     - Sparkle
-  https://github.com/MacDownApp/cocoapods-specs.git:
-    - handlebars-objc
-    - hoedown
 
 SPEC CHECKSUMS:
   GBCli: e5f988fadb68e1e3c01919f134009fed9796fde0
   handlebars-objc: dde09557cfee1dd0f34ab39595bd5eae7e17cb8b
   hoedown: 8141833441f6430686c06bbc5159d7ce615155fb
   JJPluralForm: 9a6235813990a33a63fb3eff457eb2c633af6acd
-  LibYAML: 3af2c5adf3a40dff936d087aa6a77edc10036bc5
+  LibYAML: dee5c31dcab47b168425083c2b0a6baeacdf499e
   M13OrderedDictionary: 6e157fe9c82aa6b3cd7198f5c5c30c7a6834c4a6
   MASPreferences: c08b8622dd17b47da87669e741efd7c92e970e8c
   PAPreferences: 9f0ffb1e67174a0df001af9d3320166ceb9ee6f5
   Sparkle: 06ea33170007c5937ee54da481b4481af98fac79
 
-PODFILE CHECKSUM: 1c5b20dfe418eb7c8d4ad108b08133a493681f55
+PODFILE CHECKSUM: e9356b9a2ceafda7889ba385de6e9f2d8b06cba0
 
-COCOAPODS: 1.6.1
+COCOAPODS: 1.8.4