Update JBrowse CLI to 1.5.1 and ixixx to 1.0.19 (#128)

Author: bbimber

jbrowse/package-lock.json

@@ -14,8 +14,7 @@
     "jb-pkg": "pkg ./node_modules/@jbrowse/cli --out-path ./resources/external/jb-cli"
   },
   "dependencies": {
-    "@jbrowse/cli": "1.5.0",
-    "ixixx": "1.0.16",
+    "@jbrowse/cli": "1.5.1",
     "@jbrowse/react-linear-genome-view": "^1.5.1",
     "@labkey/components": "^2.102.0",
     "assert": "^2.0.0",