Adds flutter_maps_firestore to travis config (#96)

flutter_maps_firestore/pubspec.lock

@@ -7,7 +7,14 @@ packages:
       name: async
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.2.0"
+    version: "2.1.0"
+  boolean_selector:
+    dependency: transitive
+    description:
+      name: boolean_selector
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.0.4"
   charcode:
     dependency: transitive
     description:
@@ -41,6 +48,11 @@ packages:
     description: flutter
     source: sdk
     version: "0.0.0"
+  flutter_test:
+    dependency: "direct dev"
+    description: flutter
+    source: sdk
+    version: "0.0.0"
   google_maps_flutter:
     dependency: "direct main"
     description:
@@ -76,6 +88,13 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "2.3.5"
+  matcher:
+    dependency: transitive
+    description:
+      name: matcher
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "0.12.5"
   meta:
     dependency: transitive
     description:
@@ -96,7 +115,14 @@ packages:
       name: pedantic
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.7.0"
+    version: "1.5.0"
+  quiver:
+    dependency: transitive
+    description:
+      name: quiver
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.0.2"
   sky_engine:
     dependency: transitive
     description: flutter
@@ -109,6 +135,20 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "1.5.5"
+  stack_trace:
+    dependency: transitive
+    description:
+      name: stack_trace
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.9.3"
+  stream_channel:
+    dependency: transitive
+    description:
+      name: stream_channel
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.0.0"
   string_scanner:
     dependency: transitive
     description:
@@ -123,6 +163,13 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "1.1.0"
+  test_api:
+    dependency: transitive
+    description:
+      name: test_api
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "0.2.4"
   typed_data:
     dependency: transitive
     description: