add lilToon 1.7.3

vpm.json

@@ -6,6 +6,23 @@
   "packages": {
     "jp.lilxyzw.liltoon": {
       "versions": {
+        "1.7.3": {
+          "name": "jp.lilxyzw.liltoon",
+          "version": "1.7.3",
+          "displayName": "lilToon",
+          "description": "Feature-rich toon shader.",
+          "unity": "2018.1",
+          "documentationUrl": "https://lilxyzw.github.io/lilToon/",
+          "changelogUrl": "https://lilxyzw.github.io/lilToon/#/en-us/other/changelog",
+          "licensesUrl": "https://github.com/lilxyzw/lilToon/blob/master/Assets/lilToon/LICENSE",
+          "license": "MIT",
+          "keywords": ["Toon", "Shader", "Material"],
+          "url" : "https://github.com/lilxyzw/lilToon/releases/download/1.7.3/jp.lilxyzw.liltoon-1.7.3.zip?",
+          "repo" : "https://lilxyzw.github.io/vpm-repos/vpm.json",
+          "legacyFolders" : {
+            "Assets\\lilToon" : "05d1d116436047941ad97d1b9064ee05"
+          }
+        },
         "1.7.2": {
           "name": "jp.lilxyzw.liltoon",
           "version": "1.7.2",