Fix double quotes escaping.

pubspec.lock

@@ -1,5 +1,5 @@
 # Generated by pub
-# See http://pub.dartlang.org/doc/glossary.html#lockfile
+# See https://www.dartlang.org/tools/pub/glossary#lockfile
 packages:
   async:
     dependency: transitive
@@ -21,7 +21,7 @@ packages:
       name: collection
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.14.5"
+    version: "1.14.6"
   flutter:
     dependency: "direct main"
     description: flutter
@@ -82,7 +82,7 @@ packages:
       name: petitparser
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.7.5"
+    version: "1.7.6"
   sky_engine:
     dependency: transitive
     description: flutter
@@ -108,7 +108,7 @@ packages:
       name: sqflite
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.8.2"
+    version: "0.8.3"
   stack_trace:
     dependency: transitive
     description:
@@ -150,6 +150,6 @@ packages:
       name: xml
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.6.0"
+    version: "3.0.0"
 sdks:
   dart: ">=2.0.0-dev.23.0 <=2.0.0-edge.0d5cf900b021bf5c9fa593ffa12b15bcd1cc5fe0"