refactor: replace deprecated String.prototype.substr()

.substr() is deprecated so we replace it with .slice() which works similarily but isn't deprecated

Signed-off-by: Tobias Speicher <[email protected]>

Author: CommanderRoot

lib/connection_config.js

@@ -145,7 +145,7 @@ class ConnectionConfig {
       // "+" is a url encoded char for space so it
       // gets translated to space when giving a
       // connection string..
-      this.timezone = `+${this.timezone.substr(1)}`;
+      this.timezone = `+${this.timezone.slice(1)}`;
     }
     if (this.ssl) {
       if (typeof this.ssl !== 'object') {
@@ -253,7 +253,7 @@ class ConnectionConfig {
     const options = {
       host: parsedUrl.hostname,
       port: parsedUrl.port,
-      database: parsedUrl.pathname.substr(1),
+      database: parsedUrl.pathname.slice(1),
       user: parsedUrl.username,
       password: parsedUrl.password
     };