Apply pub.dev health suggestions to improve score

example/faker.dart

@@ -2,7 +2,7 @@ library faker.example;
 
 import 'package:faker/faker.dart';
 
-main() {
+void main() {
   // Generate some different types of data.
   print(faker.address.country());
   print(faker.company.name());

lib/src/address.dart

@@ -1,15 +1,15 @@
-import 'random_generator.dart';
-import 'faker.dart';
-import 'data/address/street_suffixes.dart';
 import 'data/address/city_suffixes.dart';
-import 'data/address/neighborhoods.dart';
+import 'data/address/continents.dart';
 import 'data/address/countries.dart';
 import 'data/address/country_codes.dart';
-import 'data/address/continents.dart';
+import 'data/address/neighborhoods.dart';
+import 'data/address/street_suffixes.dart';
+import 'faker.dart';
+import 'random_generator.dart';
 
 class Address {
-  static const compassDirections = const ['North', 'East', 'West', 'South'];
-  static const cityPrefixes = const ['New', 'Lake', 'Port'];
+  static const compassDirections = ['North', 'East', 'West', 'South'];
+  static const cityPrefixes = ['New', 'Lake', 'Port'];
 
   const Address();
 
@@ -68,8 +68,8 @@ class Address {
   ///   faker.address.streetName();
   /// ```
   String streetName() => random.integer(2) == 0
-      ? '${new Faker().person.lastName()} ${streetSuffix()}'
-      : '${new Faker().person.firstName()} ${streetSuffix()}';
+      ? '${Faker().person.lastName()} ${streetSuffix()}'
+      : '${Faker().person.firstName()} ${streetSuffix()}';
 
   /// Generates a street address.
   ///

lib/src/company.dart

@@ -2,21 +2,21 @@ import 'faker.dart';
 import 'random_generator.dart';
 
 class Company {
-  static const _companySuffixes = const ['Inc', 'and Sons', 'LLC', 'Group'];
-  static const _positionPrefixes = const [
+  static const _companySuffixes = ['Inc', 'and Sons', 'LLC', 'Group'];
+  static const _positionPrefixes = [
     'Executive',
     'Assistant',
     'General',
     'Associate'
   ];
-  static const _positions = const [
+  static const _positions = [
     'President',
     'Manager',
     'Director',
     'Secretary',
     'Consultant'
   ];
-  static const _positionAreas = const [
+  static const _positionAreas = [
     'Finance',
     'IT',
     'Operations',

lib/src/conference.dart

@@ -1,5 +1,5 @@
-import 'random_generator.dart';
 import 'data/conference/conference_names.dart';
+import 'random_generator.dart';
 
 class Conference {
   const Conference();

lib/src/currency.dart

@@ -1,6 +1,6 @@
-import 'random_generator.dart';
 import 'data/currency/currency_codes.dart';
 import 'data/currency/currency_names.dart';
+import 'random_generator.dart';
 
 class Currency {
   const Currency();

lib/src/data/address/city_suffixes.dart

@@ -1,4 +1,4 @@
-const citySuffixes = const [
+const citySuffixes = [
   'town',
   'ton',
   'land',

lib/src/data/address/continents.dart

@@ -1,10 +1,10 @@
-const continents = const [
+const continents = [
   'Africa',
   'Antarctica',
   'Asia',
   'Europe',
   'North America',
-  
+
   // Some people use austrailia, whilst others use oceania.
   'Oceania',