upgrade to swift 5 and update podfile.lock

YogaKit/YogaKitSample/Podfile.lock

@@ -4,23 +4,28 @@ PODS:
   - IGListKit/Default (2.1.0):
     - IGListKit/Diffing
   - IGListKit/Diffing (2.1.0)
-  - Yoga (1.7.0)
-  - YogaKit (1.7.0):
-    - Yoga (~> 1.7)
+  - Yoga (1.14.0)
+  - YogaKit (1.18.1):
+    - Yoga (~> 1.14)
 
 DEPENDENCIES:
   - IGListKit (~> 2.1.0)
   - YogaKit (from `../../YogaKit.podspec`)
 
+SPEC REPOS:
+  trunk:
+    - IGListKit
+    - Yoga
+
 EXTERNAL SOURCES:
   YogaKit:
-    :path: ../../YogaKit.podspec
+    :path: "../../YogaKit.podspec"
 
 SPEC CHECKSUMS:
   IGListKit: b826c68ef7a4ae1626c09d4d3e1ea7a169e6c36e
-  Yoga: 2ed1d7accfef3610a67f58c0cf101a0662137f2c
-  YogaKit: 31576530e8fcae3175469719ec3212397403330b
+  Yoga: cff67a400f6b74dc38eb0bad4f156673d9aa980c
+  YogaKit: f782866e155069a2cca2517aafea43200b01fd5a
 
 PODFILE CHECKSUM: 216f8e7127767709e0e43f3711208d238fa5c404
 
-COCOAPODS: 1.1.1
+COCOAPODS: 1.11.2