🐛 Update signing option argument to '-S'

Fixes  #47

Author: carloscuesta

package.json

@@ -1,6 +1,6 @@
 {
   "name": "gitmoji-cli",
-  "version": "1.5.2",
+  "version": "1.5.3",
   "description": "A gitmoji client for using emojis on commit messages.",
   "engines": {
     "node": ">=4"

src/gitmoji.js

@@ -202,7 +202,7 @@ class GitmojiCli {
 		let signed;
 
 		if (sign) {
-			signed = '-s';
+			signed = '-S';
 		} else {
 			signed = '';
 		}

test/test.js

@@ -28,7 +28,7 @@ describe('gitmoji', function() {
 
 	describe('commit', function() {
 		it('should return the formed commit based on the input prompts', function() {
-			gitmojiCli._commit(prompts).should.equal('git commit -s -m ":zap: Improving performance issues." -m "Refactored code. #5"');
+			gitmojiCli._commit(prompts).should.equal('git commit -S -m ":zap: Improving performance issues." -m "Refactored code. #5"');
 		});
 	});
 
@@ -63,8 +63,8 @@ describe('gitmoji', function() {
 	});
 
 	describe('_isCommitSigned', function() {
-		it('should have the signed commit flag "-s"', function() {
-			gitmojiCli._isCommitSigned(true).should.equal('-s');
+		it('should have the signed commit flag "-S"', function() {
+			gitmojiCli._isCommitSigned(true).should.equal('-S');
 		});
 
 		it('should not have the signed commit flag', function() {