Add SonarSwift (+4 squashed commits)

Squashed commits:
[4a17b93] Add SonarSwift
[497f0a7] Add SonarSwift
[7c1c0e1] Add SonarSwift
[2283138] Add SonarSwift

Author: kimtaesu

.travis.yml

@@ -14,12 +14,16 @@ xcode_project: AGString.xcodeproj
 xcode_scheme:
   - AGString
 
+dist: trusty
+
+addons:
+  sonarcloud:
+    organization: "swiftalgorithmclub"
+    token:
+      secure: $SONAR_TOKEN # encrypted value of your token
 
 env:
   - CACHE_NAME=iOS       PLATFORM=iOS
-  - CACHE_NAME=macOS     PLATFORM=macOS
-  - CACHE_NAME=tvOS      PLATFORM=tvOS
-  - CACHE_NAME=watchOS   PLATFORM=watchOS
 
 install:
 - pip install codecov
@@ -68,13 +72,15 @@ script:
     fi
 
   - xcodebuild clean -project "$TRAVIS_XCODE_PROJECT" -scheme "$SCHEME" | xcpretty
-
+  - sonar-scanner
+  
   # # Run `pod lib lint` if specified
   # - if [ $POD_LINT == "YES" ] && [ "$TRAVIS_PULL_REQUEST" != "false" ]; then
   #     pod repo update > /dev/null;
   #     travis_wait 60 pod lib lint --allow-warnings;
   #   fi
 
+  
 after_success:
   - codecov
 

sonar-project.properties

@@ -0,0 +1,21 @@
+sonar.projectKey=SwiftAlgorithmClub_AGString
+sonar.organization=swiftalgorithmclub
+
+# this is the name and version displayed in the SonarCloud UI.
+sonar.projectName=AGString
+sonar.projectVersion=1.0
+ 
+# Path is relative to the sonar-project.properties file. Replace "\" by "/" on Windows.
+# This property is optional if sonar.modules is set. 
+sonar.sources=.
+ 
+
+# Encoding of the source code. Default is default system encoding
+#sonar.sourceEncoding=UTF-8
+
+# The only way to get an accurate analysis of C/C++/Objective-C files is by using the SonarSource build-wrapper
+# and setting the property "sonar.cfamily.build-wrapper-output", but it was not specified.
+# If you don't want to analyze C/C++/Objective-C files, then prevent them from being analyzed by setting the following properties:
+sonar.c.file.suffixes=-
+sonar.cpp.file.suffixes=-
+sonar.objc.file.suffixes=-