adds identical-branches to doc

README.md

@@ -350,6 +350,8 @@ List of all available rules. The rules ported from `golint` are left unchanged a
 | [`cognitive-complexity`](./RULES_DESCRIPTIONS.md#cognitive-complexity)          |  int   | Sets restriction for maximum Cognitive complexity.              |    no    |  no   |
 | [`string-of-int`](./RULES_DESCRIPTIONS.md#string-of-int)          |  n/a   | Warns on suspicious casts from int to string            |    no    |  yes   |
 | [`early-return`](./RULES_DESCRIPTIONS.md#early-return)          |  n/a   | Spots if-then-else statements that can be refactored to simplify code reading            |    no    |  no   |
+| [`identical-branches`](./RULES_DESCRIPTIONS.md#identical-branches)          |  n/a   | Spots if-then-else statements with identical `then` and `else` branches       |    no    |  no   |
+
 ## Configurable rules
 
 Here you can find how you can configure some of the existing rules:

RULES_DESCRIPTIONS.md

@@ -33,6 +33,7 @@ List of all available rules.
   - [flag-parameter](#flag-parameter)
   - [function-result-limit](#function-result-limit)
   - [get-return](#get-return)
+  - [identical-branches](#identical-branches)
   - [if-return](#if-return)
   - [increment-decrement](#increment-decrement)
   - [indent-error-flow](#indent-error-flow)
@@ -313,6 +314,12 @@ _Description_: Typically, functions with names prefixed with _Get_ are supposed
 
 _Configuration_: N/A
 
+## identical-branches
+
+_Description_: an `if-then-else` conditional with identical implementations in both branches is an error.
+
+_Configuration_: N/A
+
 ## if-return
 
 _Description_: Checking if an error is _nil_ to just after return the error or nil is redundant.