chore(deps): update dependency cocoapods to v1.15.2

Author: renovate-bot

example/Gemfile.lock

@@ -76,16 +76,18 @@ GEM
     i18n (1.14.5)
       concurrent-ruby (~> 1.0)
     json (2.7.2)
-    minitest (5.22.3)
+    minitest (5.23.0)
     molinillo (0.8.0)
     mutex_m (0.2.0)
     nanaimo (0.3.0)
     nap (1.1.0)
     netrc (0.11.0)
     nkf (0.2.0)
     public_suffix (4.0.7)
-    rexml (3.2.6)
+    rexml (3.2.8)
+      strscan (>= 3.0.9)
     ruby-macho (2.5.1)
+    strscan (3.1.0)
     typhoeus (1.4.1)
       ethon (>= 0.9.0)
     tzinfo (2.0.6)