Freezing the dependencies versions, some new versions broken the project.

Author: Rudge

build.gradle

@@ -2,16 +2,16 @@ group 'io.realworld'
 version '1.0-SNAPSHOT'
 
 ext {
-    javalin_version = "2.+"
-    jackson_version = "2.+"
+    javalin_version = "2.4.0"
+    jackson_version = "2.9.7"
     slf4j_version = "1.7.25"
-    koin_version = "1.+"
-    junit_version = "4.+"
-    unirest_version = "1.+"
-    auth0_jwt_version = "3.+"
-    hikaricp_version = "3.+"
-    h2_version = "1.+"
-    exposed_version = "0.11.+"
+    koin_version = "1.0.2"
+    junit_version = "4.12"
+    unirest_version = "1.4.9"
+    auth0_jwt_version = "3.4.1"
+    hikaricp_version = "3.3.0"
+    h2_version = "1.4.197"
+    exposed_version = "0.11.1"
     slugify_version = "2.1.+"
 }
 
@@ -58,4 +58,4 @@ compileKotlin {
 }
 compileTestKotlin {
     kotlinOptions.jvmTarget = "1.8"
-}
+}