Update dependencies.

Author: gkellogg

.travis.yml

@@ -14,5 +14,4 @@ sudo: false
 matrix:
   allow_failures:
     - rvm: jruby
-    - rvm: 2.7
 dist: trusty

rdf-turtle.gemspec

@@ -21,14 +21,14 @@ Gem::Specification.new do |gem|
   gem.required_ruby_version = '>= 2.4'
   gem.requirements          = []
   gem.add_runtime_dependency     'rdf',             '~> 3.1'
-  gem.add_runtime_dependency     'ebnf',            '~> 1.1'
+  gem.add_runtime_dependency     'ebnf',            '~> 1.2'
   gem.add_development_dependency 'rspec',           '~> 3.9'
   gem.add_development_dependency 'rspec-its',       '~> 1.3'
   gem.add_development_dependency 'rdf-isomorphic',  '~> 3.0'
   #gem.add_development_dependency 'json-ld',         '~> 3.0'
   gem.add_development_dependency 'rdf-spec',        '~> 3.1'
   gem.add_development_dependency 'rdf-vocab',       '~> 3.0'
-  gem.add_development_dependency 'json-ld',         '>= 3.0'
+  gem.add_development_dependency 'json-ld',         '>= 3.1'
 
   gem.add_development_dependency 'rake',            '~> 13.0'
   gem.add_development_dependency 'yard' ,           '~> 0.9.20'