Close changelog for the 6.1.3 release (#6163)

Also updated the testing env. Can be merged right away.

Author: tsg

CHANGELOG.asciidoc

@@ -8,7 +8,7 @@
 // Template, add newest changes here
 
 === Beats version HEAD
-https://github.com/elastic/beats/compare/v6.1.2...6.1[Check the HEAD diff]
+https://github.com/elastic/beats/compare/v6.1.3...6.1[Check the HEAD diff]
 
 ==== Breaking changes
 
@@ -77,6 +77,12 @@ https://github.com/elastic/beats/compare/v6.1.2...6.1[Check the HEAD diff]
 
 ////////////////////////////////////////////////////////////
 
+[[release-notes-6.1.3]]
+=== Beats version 6.1.3
+https://github.com/elastic/beats/compare/v6.1.2...v6.1.3[View commits]
+
+No changes in this release.
+
 [[release-notes-6.1.2]]
 === Beats version 6.1.2
 https://github.com/elastic/beats/compare/v6.1.1...v6.1.2[View commits]

libbeat/docs/release.asciidoc

@@ -8,6 +8,7 @@ This section summarizes the changes in each release. Also read
 <<breaking-changes>> for more detail about changes that affect
 upgrade.
 
+* <<release-notes-6.1.3>>
 * <<release-notes-6.1.2>>
 * <<release-notes-6.1.1>>
 * <<release-notes-6.1.0>>

testing/environments/args.yml

@@ -6,5 +6,5 @@ services:
     build:
       args:
         DOWNLOAD_URL: https://snapshots.elastic.co/downloads
-        ELASTIC_VERSION: 6.1.0-SNAPSHOT
+        ELASTIC_VERSION: 6.1.3-SNAPSHOT
         CACHE_BUST: 20171201