Update README for release v3.9.0 (palantir#1202)

README.md

@@ -239,6 +239,7 @@ A sample configuration file with all options is available [here](https://github.
 * `no-empty` disallows empty blocks.
 * `no-eval` disallows `eval` function invocations.
 * `no-inferrable-types` disallows explicit type declarations for variables or parameters initialized to a number, string, or boolean.
+   * `ignore-params` allows specifying an inferrable type as a function param
 * `no-internal-module` disallows internal `module` (use `namespace` instead).
 * `no-invalid-this` disallows using the `this` keyword outside of classes.
     * `no-this-in-function-in-method` disallows using the `this` keyword in functions within class methods.
@@ -333,8 +334,12 @@ You may enable/disable TSLint or a subset of rules within certain lines of a fil
 * `/* tslint:enable */` - Enable all rules for the rest of the file
 * `/* tslint:disable:rule1 rule2 rule3... */` - Disable the listed rules for the rest of the file
 * `/* tslint:enable:rule1 rule2 rule3... */` - Enable the listed rules for the rest of the file
+* `// tslint:disable-next-line` - Disables all rules for the following line
+* `someCode(); // tslint:disable-line` - Disables all rules for the current line
+* `// tslint:disable-next-line:rule1 rule2 rule3...` - Disables the listed rules for the next line
+* etc.
 
-Rules flags enable or disable rules as they are parsed. A rule is enabled or disabled until a later directive commands otherwise. Disabling an already disabled rule or enabling an already enabled rule has no effect.
+Rules flags enable or disable rules as they are parsed. Disabling an already disabled rule or enabling an already enabled rule has no effect.
 
 For example, imagine the directive `/* tslint:disable */` on the first line of a file, `/* tslint:enable:ban class-name */` on the 10th line and `/* tslint:enable */` on the 20th. No rules will be checked between the 1st and 10th lines, only the `ban` and `class-name` rules will be checked between the 10th and 20th, and all rules will be checked for the remainder of the file.