Update the version of linter being used

DEPS

Index: DEPS
diff --git a/DEPS b/DEPS
index 44e124ff4e9199a9f9ffe36ac956c5fcaa933615..a6c51334eed80e925b197c22fff4f737e375e37c 100644
--- a/DEPS
+++ b/DEPS
@@ -73,7 +73,7 @@ vars = {
   "isolate_tag": "@0.2.3",
   "jinja2_rev": "@2222b31554f03e62600cd7e383376a7c187967a1",
   "json_rpc_2_tag": "@2.0.2",
-  "linter_tag": "@0.1.29",
+  "linter_rev": "@6701c3238b46d5c300a4952c0e74b2df10fc4039",
   "logging_tag": "@0.11.3+1",
   "markdown_tag": "@0.11.0",
   "matcher_tag": "@0.12.0+2",
@@ -235,7 +235,7 @@ deps = {
   Var("dart_root") + "/third_party/pkg/json_rpc_2":
       (Var("github_mirror") % "json_rpc_2") + Var("json_rpc_2_tag"),
   Var("dart_root") + "/third_party/pkg/linter":
-      (Var("github_mirror") % "linter") + Var("linter_tag"),
+      (Var("github_mirror") % "linter") + Var("linter_rev"),
   Var("dart_root") + "/third_party/pkg/logging":
       (Var("github_mirror") % "logging") + Var("logging_tag"),
   Var("dart_root") + "/third_party/pkg/markdown":