Fixed invalid minimum value for connectionTimeout

In the `README.md` it says `250ms` but the code reads `100ms`:

``` java
   @Override
   public void setConnectionTimeout(long connectionTimeoutMs)
   {
      if (connectionTimeoutMs == 0) {
         this.connectionTimeout = Integer.MAX_VALUE;
      }
      else if (connectionTimeoutMs < 100) {
         throw new IllegalArgumentException("connectionTimeout cannot be less than 100ms");
      }
      else {
         this.connectionTimeout = connectionTimeoutMs;
      }
   }
```