Update Dockerfile

Dockerfile

@@ -20,7 +20,10 @@ RUN cd /usr/lib/node_modules && \
     git clone https://github.com/justadudewhohacks/opencv4nodejs.git && \
     cd opencv4nodejs && \
     npm -g i nan native-node-utils npmlog && \
-    node install/install.js
+    npm install opencv-build && \
+    npm install opencv4nodejs && \
+    npm config set opencv4nodejs:customBuildFlags "" && \
+    npm rebuild opencv4nodejs
 
 # 暴露端口
 EXPOSE 7860