build: add ESLint to script/lint and containerize linting (closes #152)

src/popup/views/addWallet.js

@@ -194,7 +194,7 @@ async function importPrivateKey(ctx) {
     let addr;
     try {
         addr = addressFromPrivateKey(key);
-    } catch (e) {
+    } catch {
         showFlash("Invalid private key.");
         return;
     }
@@ -246,7 +246,7 @@ async function importXprvKey(ctx) {
     let result;
     try {
         result = hdWalletFromXprv(xprv);
-    } catch (e) {
+    } catch {
         showFlash(
             "That extended private key is not valid. Please check it and try again.",
         );