doc: replace pub run with dart run (#141)

Author: sigurdm

templates/basic/README.md

@@ -75,7 +75,7 @@ lib
 
 The state management approach is intentionally low-level. That way, it's easy to
 take this project and run with it, without having to learn new paradigms, or having
-to remember to run `flutter pub run build_runner watch`. You are,
+to remember to run `dart run build_runner watch`. You are,
 of course, encouraged to use whatever paradigm, helper package or code generation
 scheme that you prefer.
 

templates/card/README.md

@@ -76,7 +76,7 @@ lib
 
 The state management approach is intentionally low-level. That way, it's easy to
 take this project and run with it, without having to learn new paradigms, or having
-to remember to run `flutter pub run build_runner watch`. You are,
+to remember to run `dart run build_runner watch`. You are,
 of course, encouraged to use whatever paradigm, helper package or code generation
 scheme that you prefer.
 
@@ -199,7 +199,7 @@ To update the launcher icon, first change the files
 Then, run the following:
 
 ```bash
-flutter pub run flutter_launcher_icons:main
+dart run flutter_launcher_icons:main
 ```
 
 You can [configure](https://github.com/fluttercommunity/flutter_launcher_icons#book-guide)

templates/endless_runner/README.md

@@ -109,7 +109,7 @@ lib
 
 The state management approach is intentionally low-level. That way, it's easy to
 take this project and run with it, without having to learn new paradigms, or having
-to remember to run `flutter pub run build_runner watch`. You are,
+to remember to run `dart run build_runner watch`. You are,
 of course, encouraged to use whatever paradigm, helper package or code generation
 scheme that you prefer.
 
@@ -233,7 +233,7 @@ To update the launcher icon, first change the files
 Then, run the following:
 
 ```bash
-flutter pub run flutter_launcher_icons:main
+dart run flutter_launcher_icons:main
 ```
 
 You can [configure](https://github.com/fluttercommunity/flutter_launcher_icons#book-guide)