Merge pull request #72 from povilasv/bump-ci

Change CI to build go 1.9 and later

Author: bwplotka

.travis.yml

@@ -6,11 +6,10 @@ language: go
 # * github.com/prometheus/client_golang already requires at least go1.7 since
 #   September 2017
 go:
-  - 1.6.x
-  - 1.7.x
-  - 1.8.x
   - 1.9.x
   - 1.10.x
+  - 1.11.x
+  - 1.12.x
   - master
 
 install:

CHANGELOG.md

@@ -10,6 +10,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 
 ### Added
 
+* Require go 1.9 or later and test against these versions in CI.
 * Provide metrics object as `prometheus.Collector`, for conventional metric registration.
 * Support non-default/global Prometheus registry.
 * Allow configuring counters with `prometheus.CounterOpts`.

README.md

@@ -20,6 +20,8 @@ common patterns: auth, logging and... monitoring.
 
 To use Interceptors in chains, please see [`go-grpc-middleware`](https://github.com/mwitkow/go-grpc-middleware).
 
+This library requires Go 1.9 or later.
+
 ## Usage
 
 There are two types of interceptors: client-side and server-side. This package provides monitoring Interceptors for both.