add test for -p argument

test.js

@@ -50,6 +50,26 @@ async function main() {
       }
     }
   });
+
+  assert.deepStrictEqual(await run("-j -g -p -f test.json"), {
+    results: {
+      "gulp-sourcemaps": {
+        old: "2.0.0",
+        new: "2.6.4",
+        info: "https://github.com/floridoo/gulp-sourcemaps",
+      },
+      "prismjs": {
+        old: "1.0.0",
+        new: "9000.0.2",
+        info: "https://github.com/LeaVerou/prism",
+      },
+      "svgstore": {
+        old: "^3.0.0",
+        new: "^3.0.0-2",
+        info: "https://github.com/svgstore/svgstore",
+      }
+    }
+  });
 }
 
 main().then(exit).catch(exit);

updates.js

@@ -390,13 +390,13 @@ function findVersion(data, versions, opts) {
 function findNewVersion(data, opts) {
   const versions = Object.keys(data.time).filter(version => semver.valid(version));
   const version = findVersion(data, versions, opts);
-  const oldIsPre = isRangePrerelease(opts.range);
 
   if (opts.useGreatest) {
     return version;
   } else {
     const latestTag = data["dist-tags"].latest;
     const oldVersion = semver.coerce(opts.range).version;
+    const oldIsPre = isRangePrerelease(opts.range);
     const newIsPre = isVersionPrerelease(version);
     const isGreater = semver.gt(version, oldVersion);