Change Json dependency again

The other had some incompatibilities with android.

build.gradle

@@ -1,18 +1,20 @@
 apply plugin: 'java-library'
 
+allprojects {
+    sourceCompatibility = 1.7
+    targetCompatibility = 1.7
+}
+
 repositories {
     jcenter()
 }
 
 dependencies {
-    implementation 'com.github.openjson:openjson:1.0.8'
+    implementation 'com.grack:nanojson:1.1'
     implementation 'org.jsoup:jsoup:1.9.2'
     implementation 'org.mozilla:rhino:1.7.7.1'
 
     testImplementation 'junit:junit:4.12'
-
-    sourceCompatibility = 1.7
-    targetCompatibility = 1.7
 }
 
 task sourcesJar(type: Jar, dependsOn: classes) {