Update yarn lockfile for js-slang 0.1.18

Author: yyc

yarn.lock

@@ -5926,10 +5926,10 @@ js-base64@^2.1.9:
   resolved "https://registry.yarnpkg.com/js-base64/-/js-base64-2.4.3.tgz#2e545ec2b0f2957f41356510205214e98fad6582"
   integrity sha512-H7ErYLM34CvDMto3GbD6xD0JLUGYXR3QTcH6B/tr4Hi/QpSThnCsIp+Sy5FRTw3B0d6py4HcNkW7nO/wdtGWEw==
 
-[email protected].17:
-  version "0.1.17"
-  resolved "https://registry.yarnpkg.com/js-slang/-/js-slang-0.1.17.tgz#79526e827c2aa1a6f56cb05ecd6eaa26f5eedd9f"
-  integrity sha512-KapVjqI4sBNVqyPGcZtQPROTwGm7pCAAzyHxu419t78V5UmrxMrkGODBys+wzhWMfeK8OVmA/e3Z4EwGBKhkeg==
+[email protected].18:
+  version "0.1.18"
+  resolved "https://registry.yarnpkg.com/js-slang/-/js-slang-0.1.18.tgz#0290c22dce761aa3d42444688776c707ab445ce8"
+  integrity sha512-HcasraiD4Gt/5MIMc0c3JkC4XBzwyZTw1gUS5ma7JdDF07atcEtqb8hTz89Ir1JoMwk2LuKu2niGkORIAgrsvg==
   dependencies:
     "@types/acorn" "^4.0.3"
     "@types/estree" "0.0.39"