IPv4, IPv4Net, go mod

Switch from dep to go mod (#22)

* Switch from dep to go mod

* Configure travis for newer go versions

IPRanges

Add IPRanges (#14)

* Add IPRanges

* Updates from Carl's review

* Address Carl's Review

Expose ContainsNet and add GetNetworks

Expose ContainsNet Add GetNetworks (#13)

* Expose ContainsNet Add GetNetworks

* Replace containsNet with ContainsNet

* fix wording

New utilities: ParseCIDR and ParseCIDRToNet

New utilities (#10)

* Add equivalent to ParseCIDR that parses v4 addresses in 4 bytes

* Add ParseCIDRToNet convenience to parse an IP from CIDR

v1.1.1 Bug fix

#5 Fix corner case when top node in ipTree is removed

IPSet intersections; ParseNet function

Included in this release:
#2 Add IPSet Intersection
#3 Add a parse net utility that doesn't allow non zero host part

First release

Merge pull request #1 from HenryGessau/travis

Update for Travis CI