Release v0.1.0

This is the initial release of the ntp package. Currently it supports the following features:

• Time() to query the current time according to a remote NTP server.
• Query() to query multiple pieces of time-related information from a remote NTP server.
• QueryWithOptions(), which is like Query() but with the ability to override default query options.

Time-related information returned by the Query functions includes:

• Time: the time the server transmitted its response, according to the server's clock.
• ClockOffset: the estimated offset of the client's clock relative to the server's clock. You may apply this offset to any local system clock reading once the query is complete.
• RTT: an estimate of the round-trip-time delay between the client and the server.
• Precision: the precision of the server's clock reading.
• Stratum: the "stratum" level of the server, where 1 indicates a server directly connected to a reference clock, and values greater than 1 indicating the number of hops from the reference clock.
• ReferenceID: A unique identifier for the NTP server that was contacted.
• ReferenceTime: The time at which the server last updated its local clock setting.
• RootDelay: The server's round-trip delay to the reference clock.
• RootDispersion: The server's total dispersion to the referenced clock.
• RootDistance: An estimate of the root synchronization distance.
• Leap: The leap second indicator.
• MinError: A lower bound on the clock error between the client and the server.
• Poll: the maximum polling interval between successive messages on the server.

The Response structure returned by the Query functions also contains a Response.Validate() function that returns an error if any of the fields returned by the server are invalid.