fix: failed to load prism syntax: shell

Lsnsh · Lsnsh · commit b1ccac69d8eb · 2019-02-12T14:02:13.000+08:00
diff --git a/book.json b/book.json
@@ -27,6 +27,11 @@
     "-highlight"
   ],
   "pluginsConfig": {
+    "prism": {
+      "lang": {
+        "shell": "bash"
+      }
+    },
     "search-pro": {
       "cutWordLib": "nodejieba",
       "defineWord" : ["Gitbook Use"]
