refactor: lowered sdk constraints to dart 2.15 and above (#52)

example/pubspec.lock

@@ -37,18 +37,18 @@ packages:
     dependency: transitive
     description:
       name: connectivity_plus
-      sha256: db7a4e143dc72cc3cb2044ef9b052a7ebfe729513e6a82943bc3526f784365b8
+      sha256: "3e7d1d9dbae40ae82cbe6c23c518f0c4ffe32764ee9749b9a99d32cbac8734f6"
       url: "https://pub.dev"
     source: hosted
-    version: "6.0.3"
+    version: "6.0.4"
   connectivity_plus_platform_interface:
     dependency: transitive
     description:
       name: connectivity_plus_platform_interface
-      sha256: b6a56efe1e6675be240de39107281d4034b64ac23438026355b4234042a35adb
+      sha256: "42657c1715d48b167930d5f34d00222ac100475f73d10162ddf43e714932f204"
       url: "https://pub.dev"
     source: hosted
-    version: "2.0.0"
+    version: "2.0.1"
   csslib:
     dependency: transitive
     description:
@@ -103,10 +103,10 @@ packages:
     dependency: transitive
     description:
       name: http
-      sha256: "761a297c042deedc1ffbb156d6e2af13886bb305c2a343a4d972504cd67dd938"
+      sha256: b9c29a161230ee03d3ccf545097fccd9b87a5264228c5d348202e0f0c28f9010
       url: "https://pub.dev"
     source: hosted
-    version: "1.2.1"
+    version: "1.2.2"
   http_parser:
     dependency: transitive
     description:
@@ -134,10 +134,10 @@ packages:
     dependency: transitive
     description:
       name: logger
-      sha256: af05cc8714f356fd1f3888fb6741cbe9fbe25cdb6eedbab80e1a6db21047d4a4
+      sha256: "697d067c60c20999686a0add96cf6aba723b3aa1f83ecf806a8097231529ec32"
       url: "https://pub.dev"
     source: hosted
-    version: "2.3.0"
+    version: "2.4.0"
   material_color_utilities:
     dependency: transitive
     description:
@@ -166,10 +166,10 @@ packages:
     dependency: "direct dev"
     description:
       name: package_rename
-      sha256: "5066d021830f7a984f66a3d6912b0b95efb1d91f14322ba26ceacce2a62fd312"
+      sha256: "69b30b62b540fe4637342a2d633b30d4f6475af65d3162b13d7750fe41b780c7"
       url: "https://pub.dev"
     source: hosted
-    version: "1.6.0"
+    version: "1.7.0"
   path:
     dependency: transitive
     description:
@@ -211,10 +211,10 @@ packages:
     dependency: transitive
     description:
       name: string_scanner
-      sha256: "556692adab6cfa87322a115640c11f13cb77b3f076ddcc5d6ae3c20242bedcde"
+      sha256: "688af5ed3402a4bde5b3a6c15fd768dbf2621a614950b17f04626c431ab3c4c3"
       url: "https://pub.dev"
     source: hosted
-    version: "1.2.0"
+    version: "1.3.0"
   term_glyph:
     dependency: transitive
     description:
@@ -243,10 +243,10 @@ packages:
     dependency: transitive
     description:
       name: web
-      sha256: "97da13628db363c635202ad97068d47c5b8aa555808e7a9411963c533b449b27"
+      sha256: d43c1d6b787bf0afad444700ae7f4db8827f701bc61c255ac8d328c6f4d52062
       url: "https://pub.dev"
     source: hosted
-    version: "0.5.1"
+    version: "1.0.0"
   xml:
     dependency: transitive
     description:

pubspec.yaml

@@ -5,7 +5,7 @@ homepage: https://outdatedguy.rocks
 repository: https://github.com/OutdatedGuy/internet_connection_checker_plus
 
 environment:
-  sdk: '>=3.4.1 <4.0.0'
+  sdk: '>=2.15.0 <4.0.0'
   flutter: ">=1.17.0"
 
 dependencies: