feat(core): update rules tslint@5.16 (#48)

Author: fulls1z3

README.md

@@ -30,7 +30,7 @@ If you have questions, comments or suggestions, just create an issue on this rep
 these rules with new insights, experiences and remarks in alignment with the updates on [TSLint] and [codelyzer].
 
 **Note**: The following set of rules depend on:
-- [TSLint] v5.15.0
+- [TSLint] v5.16.0
 - [codelyzer] v5.0.0
 
 ## Table of contents:
@@ -577,7 +577,12 @@ them is allowed by TypeScript*).
 
 - *Do not use* **else** blocks ending with a `break`, `continue`, `return` or `throw` statement.
 ```json
-"unnecessary-else": true
+"unnecessary-else": [
+  true, 
+  {
+    "allow-else-if": true
+  }
+]
 ```
 
 - *Do not use* any *always* **truthy**/**falsy** condition in **boolean expressions** (*except right-hand operand `&&` or `||`*). 

tslint.json

@@ -153,7 +153,12 @@
     ],
     "no-tautology-expression": true,
     "no-boolean-literal-compare": true,
-    "unnecessary-else": true,
+    "unnecessary-else": [
+      true,
+      {
+        "allow-else-if": true
+      }
+    ]
     "strict-boolean-expressions": [
       true,
       "allow-undefined-union",