adds pretty error printing for yaml parsing

Author: pderaaij

lib/loader.js

@@ -119,7 +119,7 @@ const recursivelyLoadRulesets = async (ruleset, loadedRulesets, options) => {
     }
 
     try {
-        const data = yaml.parse(text);
+        const data = yaml.parse(text, { prettyErrors: true });
 
         loadedRulesets.push(ruleset);
 
@@ -178,9 +178,9 @@ const loadSpec = async (source, options = {}) => {
     return await readSpecFile(source, options)
         .then(content => {
             try {
-                return yaml.parse(content);
+                return yaml.parse(content, { prettyErrors: true } );
             } catch (err) {
-                throw new ReadError(err.message);
+                throw new ReadError("\nLine: " + err.linePos.start.line + ", col: " + err.linePos.start.col + " " + err.message);
             }
         }, err => {
             throw new OpenError(err.message)

package.json

@@ -43,7 +43,7 @@
     "oas-resolver": "^2.2.4",
     "oas-validator": "^3.0.1",
     "redoc": "v2.0.0-rc.8-1",
-    "yaml": "^1.2.0"
+    "yaml": "^1.5.0"
   },
   "devDependencies": {
     "babel-core": "^6.24.1",