add --no-optional to npm install to skip the build error

Dockerfile

@@ -6,7 +6,7 @@ WORKDIR /usr/src/app
 
 # Install app dependencies
 COPY ./* /usr/src/app/
-RUN npm install
+RUN npm install --no-optional
 
 # Bundle app source
 COPY . /usr/src/app

README.md

@@ -15,7 +15,7 @@ Dependencies:
 Then check out the project and run:
 
 ```sh
-npm install
+npm install --no-optional
 ```
 
 ### Running
@@ -58,3 +58,4 @@ ports:
   * If latest version also produces errors, try installing v4.5.0.
     * An easy fix for that would be [to use `nvm`](http://stackoverflow.com/a/7718438/1585523).
 * If you get any node-sass errors, try running `npm rebuild node-sass --force` or the remove `node_modules` folder and run `npm install` again
+* As 2019 March, npm install won't work due to native module build errors. Use "npm install --no-optional" to skip native build.

docker-compose.yml

@@ -4,7 +4,7 @@ services:
     wittr:
         image: node:latest
         container_name: c-wittr
-        command: /bin/bash -c "if [ ! -d node_modules ] ; then npm install ; fi && npm run serve"
+        command: /bin/bash -c "if [ ! -d node_modules ] ; then npm install --no-optional ; fi && npm run serve"
         working_dir: /usr/src/app
         volumes:
             - .:/usr/src/app