fix the bug (#64)

Author: peifeng-unity

.yamato/yamato-config.yml

@@ -15,7 +15,7 @@ commands:
     - command: |
         linecoverage=$(head -2 test-results/coverage.xml | grep -Eo 'line-rate="[0-9]+([.][0-9]+)?"' | grep -Eo "[0-9]+([.][0-9]+)?")
         echo "Line coverage: $linecoverage"
-        if [[ $linecoverage < 0 ]]; then exit 1; fi
+        if (( $(echo "$linecoverage < 0.3" | bc -l) )); then exit 1; fi
 triggers:
     cancel_old_ci: true
     expression: |