Remove alias Command#call_with

Author: John Doe

README.md

@@ -57,10 +57,10 @@ $ gem install ruby-sh
 ### Basic Syntax
 
 ```ruby
-# Create a command, use `cmd`/`command`
+# Create a command
 cmd = Rubsh.cmd("ls")
 
-# Invoke a command, use `call`/`call_with`
+# Invoke it
 result = cmd.call("-la")
 
 # Print result

lib/rubsh/command.rb

@@ -32,7 +32,6 @@ def call(*args, **kwargs)
       rcmd.__run
       rcmd
     end
-    alias_method :call_with, :call
 
     # @param args [String, Symbol, #to_s, Hash]
     # @param kwargs [Hash]