updated OS versions in podfile

ScaleCodec.podspec

@@ -13,10 +13,10 @@ SCALE codec implementation for Swift language. Supports all SCALE standard types
   s.author           = { 'Tesseract Systems, Inc.' => 'info@tesseract.one' }
   s.source           = { :git => 'https://github.com/tesseract-one/ScaleCodec.swift.git', :tag => s.version.to_s }
 
-  s.ios.deployment_target = '9.0'
-  s.osx.deployment_target = '10.10'
-  s.tvos.deployment_target = '9.0'
-  s.watchos.deployment_target = '2.0'
+  s.ios.deployment_target = '10.0'
+  s.osx.deployment_target = '10.12'
+  s.tvos.deployment_target = '10.0'
+  s.watchos.deployment_target = '6.0'
 
   s.swift_version = '5.4'
 
@@ -27,7 +27,7 @@ SCALE codec implementation for Swift language. Supports all SCALE standard types
   s.source_files = 'Sources/ScaleCodec/**/*.swift', 'Sources/DoubleWidth/*.swift'
 
   s.test_spec 'Tests' do |test_spec|
-    test_spec.platforms = {:ios => '9.0', :osx => '10.10', :tvos => '9.0'}
+    test_spec.platforms = {:ios => '10.0', :osx => '10.12', :tvos => '10.0'}
     test_spec.source_files = 'Tests/ScaleCodecTests/**/*.swift', 'Tests/DoubleWidthTests/DoubleWidthTests.swift'
   end
 end