Update telegraf image

library/telegraf

@@ -1,13 +1,6 @@
 Maintainers: Jonathan A. Sternberg <jonathan@influxdata.com> (@jsternberg)
 GitRepo: git://github.com/influxdata/influxdata-docker
-GitCommit: 9a2e98eb81a6aa5c3e62308b4390e70cd5c1ad67
-
-Tags: 1.5, 1.5.3
-Architectures: amd64, arm32v7, arm64v8
-Directory: telegraf/1.5
-
-Tags: 1.5-alpine, 1.5.3-alpine
-Directory: telegraf/1.5/alpine
+GitCommit: 8c29cb559b6ad7ae91f67b64038c157303519ba8
 
 Tags: 1.6, 1.6.4
 Architectures: amd64, arm32v7, arm64v8
@@ -16,9 +9,16 @@ Directory: telegraf/1.6
 Tags: 1.6-alpine, 1.6.4-alpine
 Directory: telegraf/1.6/alpine
 
-Tags: 1.7, 1.7.4, latest
+Tags: 1.7, 1.7.4
 Architectures: amd64, arm32v7, arm64v8
 Directory: telegraf/1.7
 
-Tags: 1.7-alpine, 1.7.4-alpine, alpine
+Tags: 1.7-alpine, 1.7.4-alpine
 Directory: telegraf/1.7/alpine
+
+Tags: 1.8, 1.8.0, latest
+Architectures: amd64, arm32v7, arm64v8
+Directory: telegraf/1.8
+
+Tags: 1.8-alpine, 1.8.0-alpine, alpine
+Directory: telegraf/1.8/alpine