docs: include some examples, explicitly state success

.gitignore

@@ -3,6 +3,7 @@
 .nyc_output/
 node_modules/
 out/
+package-lock.json
 yarn-error.log
 
 *.bak

.npmignore

@@ -19,6 +19,7 @@ vendor/
 Dockerfile
 licensed.yml
 Makefile
+package-lock.json
 renovate.json
 tsconfig.json
 yarn-*

README.md

@@ -28,10 +28,23 @@ fields, and other **g**ood stuff.
 ## Usage
 
 ```shell
-> cat rules/examples/kubernetes-require-resources-pass.yml | salty-dog \
-    --rules rules/kubernetes.yml \
-    --source - \
-    --tag important
+> cat rules/examples/kubernetes-require-resources-fail.yml |\
+    salty-dog \
+      --rules rules/kubernetes.yml \
+      --source - \
+      --tag important |\
+    ./node_modules/.bin/bunyan
+
+[2019-06-15T23:56:04.764Z] ERROR: salty-dog/22211 on cerberus: some rules failed (errors=1)
+
+> cat rules/examples/kubernetes-require-resources-pass.yml |\
+    salty-dog \
+      --rules rules/kubernetes.yml \
+      --source - \
+      --tag important |\
+    ./node_modules/.bin/bunyan
+
+[2019-06-15T23:53:34.223Z]  INFO: salty-dog/19839 on cerberus: all rules passed
 ```
 
 ### Options

src/index.ts

@@ -99,6 +99,7 @@ export async function main(argv: Array<string>): Promise<number> {
       return STATUS_ERROR;
     }
   } else {
+    logger.info('all rules passed');
     return STATUS_SUCCESS;
   }
 }