fix readme and warning

Author: Maxim Lobanov

README.md

@@ -41,8 +41,9 @@ steps:
 - run: npm test
 ```
 
-Checking latest version of Node.js:  
-(By default, action searches version locally before downloading it. The flag forces action to check if cached version is not outdated)
+Check latest version:  
+> In basic example, without `check-latest` flag, the action tries to resolve version from local cache firstly and download only if it is not found. Local cache on image is updated with a couple of weeks latency.  
+`check-latest` flag forces the action to check if the cached version is the latest one. It reduces latency significantly but it is much more likely to incur version downloading.
 ```yaml
 steps:
 - uses: actions/checkout@v2

dist/index.js

@@ -13153,7 +13153,7 @@ function resolveVersionFromManifest(versionSpec, stable, auth) {
             return info === null || info === void 0 ? void 0 : info.resolvedVersion;
         }
         catch (err) {
-            core.warning('Unable to resolve version from manifest...');
+            core.info('Unable to resolve version from manifest...');
             core.debug(err.message);
         }
     });

src/installer.ts

@@ -219,7 +219,7 @@ async function resolveVersionFromManifest(
     const info = await getInfoFromManifest(versionSpec, stable, auth);
     return info?.resolvedVersion;
   } catch (err) {
-    core.warning('Unable to resolve version from manifest...');
+    core.info('Unable to resolve version from manifest...');
     core.debug(err.message);
   }
 }