Fix the codecov upload issue, enable gather code coverage data

.travis.yml

@@ -43,4 +43,4 @@ script:
   - mv ~/Library/Developer/Xcode/DerivedData/ ./DerivedData/iOS
 
 after_success:
-    - bash <(curl -s https://codecov.io/bash) -D './DerivedData/iOS' -J '^SDWebImageWebPCoder$' -F 'iOS'
+    - bash <(curl -s https://codecov.io/bash) -D './DerivedData/iOS' -J '^SDWebImageWebPCoder$' -c -X gcov -F ios

SDWebImageWebPCoder.xcodeproj/xcshareddata/xcschemes/SDWebImageWebPCoderTests.xcscheme

@@ -26,7 +26,8 @@
       buildConfiguration = "Debug"
       selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
       selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
-      shouldUseLaunchSchemeArgsEnv = "YES">
+      shouldUseLaunchSchemeArgsEnv = "YES"
+      codeCoverageEnabled = "YES">
       <Testables>
          <TestableReference
             skipped = "NO">
@@ -39,8 +40,6 @@
             </BuildableReference>
          </TestableReference>
       </Testables>
-      <AdditionalOptions>
-      </AdditionalOptions>
    </TestAction>
    <LaunchAction
       buildConfiguration = "Debug"
@@ -61,8 +60,6 @@
             ReferencedContainer = "container:SDWebImageWebPCoder.xcodeproj">
          </BuildableReference>
       </MacroExpansion>
-      <AdditionalOptions>
-      </AdditionalOptions>
    </LaunchAction>
    <ProfileAction
       buildConfiguration = "Release"