Update Generation Script To Understand Generics

[JakeWharton]

public class LruCacheAssert<K, V> extends AbstractAssert<LruCacheAssert<K, V>, LruCache<K, V>> {

should generate:

public static <K, V> LruCacheAssert<K, V> assertThat(LruCache<K, V> actual) {
  return new LruCacheAssert<K, V>(actual);
}

[JakeWharton]

Fixed by #7.