feat(logger): add info, warning, error, and critical methods

src/logger.ts

@@ -1,8 +1,11 @@
 import {
     LogLevel,
     DEBUG,
-    NOTSET,
+    INFO,
     WARNING,
+    ERROR,
+    CRITICAL,
+    NOTSET,
     checkLevel,
 } from './log-level';
 import { 
@@ -173,6 +176,34 @@ export class Logger extends Filterer {
         if (this.isEnabledFor(DEBUG)) { this._log(DEBUG, msg, options) }
     }
 
+    /**
+     * Log 'msg % args' with severity 'INFO'
+     */
+    public info(msg: string, options?: LogOptions) {
+        if (this.isEnabledFor(INFO)) { this._log(INFO, msg, options) }
+    }
+
+    /**
+     * Log 'msg % args' with severity 'WARNING'
+     */
+    public warning(msg: string, options?: LogOptions) {
+        if (this.isEnabledFor(WARNING)) { this._log(WARNING, msg, options) }
+    }
+
+    /**
+     * Log 'msg % args' with severity 'ERROR'
+     */
+    public error(msg: string, options?: LogOptions) {
+        if (this.isEnabledFor(ERROR)) { this._log(ERROR, msg, options) }
+    }
+
+    /**
+     * Log 'msg % args' with severity 'CRITICAL'
+     */
+    public critical(msg: string, options?: LogOptions) {
+        if (this.isEnabledFor(CRITICAL)) { this._log(CRITICAL, msg, options) }
+    }
+
     /**
      * A factory method which can be overriden in subclasses to create
      * specialized LogRecords.