Update to ensure latest version of toolchain

action.yml

@@ -4,7 +4,7 @@ author: 'Héctor Ramón'
 inputs:
   rust-version:
     description: 'The toolchain name, such as stable, nighly, or 1.8.0'
-    default: '1.37.0'
+    default: 'stable'
 runs:
   using: 'node12'
   main: 'lib/main.js'

lib/main.js

@@ -25,6 +25,7 @@ function run() {
             if (version) {
                 yield rustup.install(version);
                 exec.exec('rustup', ['default', version]);
+                exec.exec('rustup', ['update', version]);
             }
         }
         catch (error) {

src/main.ts

@@ -11,6 +11,7 @@ async function run() {
       await rustup.install(version);
 
       exec.exec('rustup', ['default', version]);
+      exec.exec('rustup', ['update', version]);
     }
   } catch (error) {
     core.setFailed(error.message);