fix geetest v4 risk_type

Author: poplers24

README.md

@@ -245,6 +245,7 @@ captcha.setCaptchaId("72bf15796d0b69c43867452fea615052");
 captcha.setApiServer("api-na.geetest.com");
 captcha.setChallenge("12345678abc90123d45678ef90123a456b");
 captcha.setUrl("https://mysite.com/captcha.html");
+captcha.setRiskType("slide|1779887038.402245|6563f67750ef47d9b1302ef524gf719f|04fe1ca6a68510c08f6f9aacfe4ce284a9e672d9ecb4212e6cd593ad583ef054");
 captcha.setProxy("HTTPS", "login:password@IP_address:PORT");
 ```
 

src/main/java/examples/GeeTestV4OptionsExample.java

@@ -18,6 +18,7 @@ public static void main(String[] args) {
         captcha.setApiServer("api-na.geetest.com");
         captcha.setChallenge("12345678abc90123d45678ef90123a456b");
         captcha.setUrl("https://mysite.com/captcha.html");
+        captcha.setRiskType("slide|1779887038.402245|6563f67750ef47d9b1302ef524gf719f|04fe1ca6a68510c08f6f9aacfe4ce284a9e672d9ecb4212e6cd593ad583ef054");
         captcha.setProxy("HTTPS", "login:password@IP_address:PORT");