fix(pubspec): Add missing upper bound version constraints

Author: vicb

pubspec.yaml

@@ -13,20 +13,20 @@ homepage: https://angulardart.org
 environment:
   sdk: '>=1.4.0'
 dependencies:
-  args: '>=0.10.0 < 0.11.0'
+  args: '>=0.10.0 <0.11.0'
   analyzer: '>=0.15.0 <0.19.0'
   barback: '>=0.13.0 <0.17.0'
   browser: '>=0.10.0 <0.11.0'
   code_transformers: '>=0.1.4+2 <0.2.0'
   collection: '>=0.9.1 <1.0.0'
-  di: '>=2.0.0-alpha.10'
+  di: '>=2.0.0-alpha.10 <3.0.0'
   html5lib: '>=0.10.0 <0.11.0'
   intl: '>=0.8.7 <0.10.0'
   perf_api: '>=0.0.8 <0.1.0'
   route_hierarchical: '>=0.4.21 <0.5.0'
   web_components: '>=0.3.3 <0.4.0'
 dev_dependencies:
-  benchmark_harness: '>=1.0.0'
+  benchmark_harness: '>=1.0.0 <2.0.0'
   guinness: '>=0.1.3 <0.2.0'
   mock: '>=0.10.0 <0.12.0'
   protractor: '0.0.5'