pub upgrade (#631)

diff --git a/pubspec.lock b/pubspec.lock
index cf5d3ec..a7cd6b0 100644
--- a/pubspec.lock
+++ b/pubspec.lock
@@ -154,7 +154,7 @@
       name: codemirror
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.5.21+5.58.0"
+    version: "0.5.23+5.59.1"
   collection:
     dependency: transitive
     description:
@@ -310,7 +310,7 @@
     source: hosted
     version: "0.16.1"
   io:
-    dependency: "direct main"
+    dependency: transitive
     description:
       name: io
       url: "https://pub.dartlang.org"
@@ -463,13 +463,6 @@
       url: "https://pub.dartlang.org"
     source: hosted
     version: "0.7.4"
-  shelf_router_generator:
-    dependency: "direct dev"
-    description:
-      name: shelf_router_generator
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "0.7.2+3"
   shelf_static:
     dependency: transitive
     description:
@@ -484,13 +477,6 @@
       url: "https://pub.dartlang.org"
     source: hosted
     version: "0.2.3"
-  source_gen:
-    dependency: transitive
-    description:
-      name: source_gen
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "0.9.10+1"
   source_map_stack_trace:
     dependency: transitive
     description:
@@ -582,13 +568,6 @@
       url: "https://pub.dartlang.org"
     source: hosted
     version: "0.1.1+3"
-  tuneup:
-    dependency: "direct dev"
-    description:
-      name: tuneup
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "0.3.7"
   typed_data:
     dependency: transitive
     description:
@@ -596,13 +575,6 @@
       url: "https://pub.dartlang.org"
     source: hosted
     version: "1.2.0"
-  uuid:
-    dependency: "direct main"
-    description:
-      name: uuid
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "2.2.2"
   vm_service:
     dependency: transitive
     description:
@@ -632,7 +604,7 @@
     source: hosted
     version: "0.7.4"
   yaml:
-    dependency: "direct main"
+    dependency: transitive
     description:
       name: yaml
       url: "https://pub.dartlang.org"