Fix off-by-one error in Method#source_range

lib/pry/default_commands/context.rb

@@ -24,7 +24,7 @@ class Pry
           if show_method?
             file   = @method.source_file
             start  = @method.source_range.begin
-            finish = @method.source_range.end - 1
+            finish = @method.source_range.end
             marker = target.eval("__LINE__")
           else
             file   = target.eval("__FILE__")

lib/pry/method.rb

@@ -317,7 +317,7 @@ class Pry
     # @return [Range, nil] The range of lines in `source_file` which contain
     #    the method's definition, or `nil` if that information is unavailable.
     def source_range
-      source_location.nil? ? nil : (source_line)...(source_line + source.lines.count)
+      source_location.nil? ? nil : (source_line)..(source_line + source.lines.count - 1)
     end
 
     # @return [Symbol] The visibility of the method. May be `:public`,