Set safe side options

Even in the example, it is not safe to enable critically options like path ("."),  recursive("true"), silent("false"), because if somebody accidentally runs it, then it will update every file in that current path, and extremely hard to Undo the changes.

README.md

@@ -95,9 +95,9 @@ var replace = require("replace");
 replace({
   regex: "foo",
   replacement: "bar",
-  paths: ['.'],
-  recursive: true,
-  silent: true,
+  paths: ['./Test/'],
+  recursive: false,
+  silent: false,
 });
 ```