adding freemarker 2.3.29 for UIServer

Author: fbrunacci

libraries/deeplearning4j-cuda.json

@@ -2,10 +2,12 @@
   "properties": {
     "v": "1.0.0-beta6",
     "cuda": "10.2",
-    "slf4j": "1.7.25"
+    "slf4j": "1.7.25",
+    "freemarker": "2.3.29"
   },
   "link": "https://github.com/eclipse/deeplearning4j",
   "dependencies": [
+    "org.freemarker:freemarker:$freemarker",
     "org.nd4j:nd4j-api:$v",
     "org.nd4j:nd4j-cuda-$cuda:$v",
     "org.nd4j:nd4j-cuda-$cuda-platform:$v",

libraries/deeplearning4j.json

@@ -1,10 +1,12 @@
 {
   "properties": {
     "v": "1.0.0-beta6",
-    "slf4j": "1.7.25"
+    "slf4j": "1.7.25",
+    "freemarker": "2.3.29"
   },
   "link": "https://github.com/eclipse/deeplearning4j",
   "dependencies": [
+    "org.freemarker:freemarker:$freemarker",
     "org.nd4j:nd4j-api:$v",
     "org.nd4j:nd4j-native:$v",
     "org.nd4j:nd4j-native-platform:$v",