Fix deprecated linter (#6)

Author: mchavez

.golangci.yml

@@ -57,15 +57,13 @@ linters-settings:
 linters:
   disable-all: true
   enable:
-    - deadcode # Finds unused code
     - errcheck # Errcheck is a program for checking for unchecked errors in go programs. These unchecked errors can be critical bugs in some cases
     - gosimple # Linter for Go source code that specializes in simplifying a code
     - govet # Vet examines Go source code and reports suspicious constructs, such as Printf calls whose arguments do not align with the format string
     - ineffassign # Detects when assignments to existing variables are not used
     - staticcheck # Staticcheck is a go vet on steroids, applying a ton of static analysis checks
     - typecheck # Like the front-end of a Go compiler, parses and type-checks Go code
     - unused # Checks Go code for unused constants, variables, functions and types
-    - varcheck # Finds unused global variables and constants
     - asasalint # Check for pass []any as any in variadic func(...any)
     - asciicheck # Simple linter to check that your code does not contain non-ASCII identifiers
     - bidichk # Checks for dangerous unicode character sequences