add write --skip-unchanged flag (segmentio#175)

By default a write attempt results in a new history entry even when the value is unchanged. Under most use this is no big deal but I've run into cases where we update secrets through automation, for example syncing during transitions between systems, and the history is filled with a bunch of non-changes. This adds a simple option to ignore writing the secret if the value is unchanged.

Add Windows Support (segmentio#172)

Adds a Windows build target

release v2.3.2

add changelog for v2.3.1 vs 2.2.0

add changelog for v2.3.1 vs 2.2.0

Reinstate analytics (segmentio#139)

* add analytics original patch

* use gopkg.in to ensure we use v3 of analytics-go

* update modules for analytics-go

Merge pull request segmentio#136 from segmentio/systmeizer/add-analytics

Adding analytics for usage metrics

add CHANGELOG.md; and entry for v2.2.0 v 2.1.1

Add deb/rpm packages (segmentio#129)

* use nfpm to create deb and rpm packages

* Split Makefile into Makefile (users) and Makefile.release (maintainers)

* Split Makefile.tools out

* push deb/rpm to packagecloud

(cherry picked from commit b8363c1)

Add deb/rpm packages (segmentio#129)

* use nfpm to create deb and rpm packages

* Split Makefile into Makefile (users) and Makefile.release (maintainers)

* Split Makefile.tools out

* push deb/rpm to packagecloud