chore: update pubspec.yaml

Author: andriyoganp

example/pubspec.lock

@@ -21,7 +21,7 @@ packages:
       path: ".."
       relative: true
     source: path
-    version: "0.0.12"
+    version: "0.0.13"
   blue_thermal_printer:
     dependency: transitive
     description:
@@ -277,4 +277,4 @@ packages:
     version: "5.1.1"
 sdks:
   dart: ">=2.16.0 <3.0.0"
-  flutter: ">=1.16.0"
+  flutter: ">=1.20.0"

pubspec.lock

@@ -270,4 +270,4 @@ packages:
     version: "5.1.1"
 sdks:
   dart: ">=2.16.0 <3.0.0"
-  flutter: ">=1.16.0"
+  flutter: ">=1.20.0"

pubspec.yaml

@@ -5,21 +5,22 @@ homepage: https://github.com/andriyoganp/blue_print_pos
 
 environment:
   sdk: ">=2.16.0 <3.0.0"
+  flutter: ">=1.20.0"
 
 dependencies:
   # Handler bluetooth for Android
-  blue_thermal_printer: 1.2.0
+  blue_thermal_printer: ^1.2.0
   # Utilities for generate ByteBuffer
-  esc_pos_utils_plus: 2.0.1+6
-  # Framewework
+  esc_pos_utils_plus: ^2.0.1+6
+  # Framework
   flutter:
     sdk: flutter
   # Handler bluetooth for iOS
-  flutter_blue: 0.8.0
+  flutter_blue: ^0.8.0
   # Image utilities
-  image: 3.1.3
+  image: ^3.1.3
   # Generate qr image painter
-  qr_flutter: 4.0.0
+  qr_flutter: ^4.0.0
 
 dev_dependencies:
   flutter_test: