bump max LND version to <0.21 (#55)

Author: Dominion5254

manifest.yaml

@@ -3,6 +3,7 @@ title: "LNBits"
 version: 1.3.0.1
 release-notes: |
   * Update to v1.3.0 [release notes](https://github.com/lnbits/lnbits/releases/tag/v1.3.0)
+  * Bump max LND version
 license: MIT
 wrapper-repo: "https://github.com/Start9Labs/lnbits-startos"
 upstream-repo: "https://github.com/lnbits/lnbits"
@@ -77,7 +78,7 @@ interfaces:
       - http
 dependencies:
   lnd:
-    version: ">=0.14.3 <0.20.0"
+    version: ">=0.14.3 <0.21.0"
     description: Used to communicate with the Lightning Network.
     requirement:
       type: "opt-in"