Fix missing NistCurve class

Author: Spomky

src/Component/Core/composer.json

@@ -24,7 +24,8 @@
         "ext-gmp": "*",
         "ext-mbstring": "*",
         "fgrosse/phpasn1": "^2.0",
-        "spomky-labs/base64url": "^1.0|^2.0"
+        "spomky-labs/base64url": "^1.0|^2.0",
+        "web-token/jwt-util-ecc": "^1.3"
     },
     "require-dev": {
         "phpunit/phpunit": "^6.0|^7.0"