adding kcov

ci/install.sh

@@ -42,6 +42,8 @@ main() {
            --git japaric/cross \
            --tag $tag \
            --target $target
+
+    cargo install kcov
 }
 
 main

ci/script.sh

@@ -11,8 +11,8 @@ main() {
         return
     fi
 
-    cross test --target $TARGET
-    cross test --target $TARGET --release
+    cross kcov --target $TARGET
+    cross kcov --target $TARGET --release
 
     # TODO: uncommented when binaries are available
     #cross run --target $TARGET