Update travis build matrix.

.travis.yml

@@ -14,6 +14,9 @@ jobs:
         - git remote update
         - git diff --exit-code remotes/b/master -- common
     - stage: examples
+      before_install:
+        - 'gem update --system --conservative || (gem i "rubygems-update:~>2.7" --no-document && update_rubygems)'
+        - 'gem update bundler --conservative'
       name: "Verify examples are consistent"
       language: ruby
       rvm: 2.5
@@ -27,6 +30,9 @@ jobs:
         - docker
       # Because (alas) rawgit is end of life, we'll run this only on the master branch.
       if: branch = master
+      before_install:
+        - 'gem update --system --conservative || (gem i "rubygems-update:~>2.7" --no-document && update_rubygems)'
+        - 'gem update bundler --conservative'
       script:
         - docker pull stupchiy/checklink
         - docker run -it stupchiy/checklink -b -X '(http|https|mailto):' "https://labs.w3.org/spec-generator/?type=respec&url=https://w3c.github.io/json-ld-syntax/index.html?specStatus=WD;shortName=json-ld11"

Gemfile.lock

@@ -1,6 +1,6 @@
 GIT
   remote: git://github.com/ruby-rdf/json-ld.git
-  revision: 147930bfd2bceeef4d6f79f203cddc4134e3b65d
+  revision: d88f81b143a602a6174b8b9da79c2fc6c04d127b
   branch: develop
   specs:
     json-ld (3.0.2)
@@ -18,7 +18,7 @@ GEM
       i18n
     builder (3.2.3)
     colorize (0.8.1)
-    concurrent-ruby (1.1.4)
+    concurrent-ruby (1.1.5)
     connection_pool (2.2.2)
     ebnf (1.1.3)
       rdf (~> 3.0)
@@ -31,7 +31,7 @@ GEM
     hamster (3.0.0)
       concurrent-ruby (~> 1.0)
     htmlentities (4.3.4)
-    i18n (1.5.3)
+    i18n (1.6.0)
       concurrent-ruby (~> 1.0)
     json-ld-preloaded (3.0.2)
       json-ld (~> 3.0)
@@ -152,9 +152,9 @@ GEM
     sparql-client (3.0.1)
       net-http-persistent (>= 2.9, < 4)
       rdf (~> 3.0)
-    sxp (1.0.1)
-      rdf (>= 2.2, < 4.0)
-    temple (0.8.0)
+    sxp (1.0.2)
+      rdf (~> 3.0)
+    temple (0.8.1)
     tilt (2.0.9)
 
 PLATFORMS