project: add SwiftyBeaver for log

SwiftyBeaver improves log readability and allows
to use different logging levels and different kinds of
outputs. Way better than simples "print()"

Change-Id: Iaa3087952095d4344b3cd85314892c4fcd25251c
diff --git a/Ring/Cartfile.resolved b/Ring/Cartfile.resolved
index e2c6be1..d31aa67 100644
--- a/Ring/Cartfile.resolved
+++ b/Ring/Cartfile.resolved
@@ -2,5 +2,6 @@
 github "ReactiveX/RxSwift" "3.5.0"
 github "RxSwiftCommunity/RxDataSources" "1.0.4"
 github "RxSwiftCommunity/RxRealm" "0.6.0"
+github "SwiftyBeaver/SwiftyBeaver" "1.3.0"
 github "pkluz/PKHUD" "4.2.3"
 github "realm/realm-cocoa" "v2.8.3"