Use cocoapods 1.7 for linting

Gemfile

@@ -4,4 +4,4 @@ source "https://rubygems.org"
 
 gem "fastlane"
 gem "jazzy"
-gem "cocoapods", "~> 1.6"
+gem "cocoapods", "~> 1.7.beta"

Gemfile.lock

@@ -12,11 +12,11 @@ GEM
     atomos (0.1.3)
     babosa (1.0.2)
     claide (1.0.2)
-    cocoapods (1.6.1)
+    cocoapods (1.7.0.beta.2)
       activesupport (>= 4.0.2, < 5)
       claide (>= 1.0.2, < 2.0)
-      cocoapods-core (= 1.6.1)
-      cocoapods-deintegrate (>= 1.0.2, < 2.0)
+      cocoapods-core (= 1.7.0.beta.2)
+      cocoapods-deintegrate (>= 1.0.3, < 2.0)
       cocoapods-downloader (>= 1.2.2, < 2.0)
       cocoapods-plugins (>= 1.0.0, < 2.0)
       cocoapods-search (>= 1.0.0, < 2.0)
@@ -31,7 +31,7 @@ GEM
       nap (~> 1.0)
       ruby-macho (~> 1.4)
       xcodeproj (>= 1.8.1, < 2.0)
-    cocoapods-core (1.6.1)
+    cocoapods-core (1.7.0.beta.2)
       activesupport (>= 4.0.2, < 6)
       fuzzy_match (~> 2.0.4)
       nap (~> 1.0)
@@ -230,7 +230,7 @@ PLATFORMS
   ruby
 
 DEPENDENCIES
-  cocoapods (~> 1.6)
+  cocoapods (~> 1.7.beta)
   fastlane
   jazzy