Update plugin.py

Support Chinese display

[before]：
TestForSyncProduct::test_1_valueValid[test Case Name-add]  
TestForSyncProduct::test_2_valueValid[\u6d4b\u8bd5\u7528\u4f8b\u540d\u79f0-update]

[now]：
TestForSyncProduct::test_1_valueValid[test Case Name-add]
TestForSyncProduct::test_2_valueValid[测试用例名称-update]

Author: lzhu666

pytest_html/plugin.py

@@ -103,7 +103,7 @@ def __init__(self, logfile, config):
 
     class TestResult:
         def __init__(self, outcome, report, logfile, config):
-            self.test_id = report.nodeid
+            self.test_id = report.nodeid.encode("utf-8").decode("unicode_escape")
             if getattr(report, "when", "call") != "call":
                 self.test_id = "::".join([report.nodeid, report.when])
             self.time = getattr(report, "duration", 0.0)