Don't require to type full version

psvm.js.patch

diff --git a/package.json b/package.json
index ae772cd..02fae50 100644
--- a/package.json
+++ b/package.json
@@ -3,9 +3,9 @@
   "version": "0.1.2",
   "description": "Purescript Version Manager",
   "preferGlobal": "true",
-  "repository" : {
-    "type" : "git",
-    "url" : "https://github.com/ThomasCrvsr/psvm-js.git"
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/ThomasCrvsr/psvm-js.git"
   },
   "bin": {
     "psvm": "src/cli.js"
@@ -20,6 +20,7 @@
     "nugget": "^1.5.4",
     "ramda": "^0.17.1",
     "rimraf": "^2.4.2",
+    "semver": "^5.3.0",
     "tarball-extract": "0.0.3"
   }
 }
diff --git a/src/lib.js b/src/lib.js
index 875a9d7..cbfbb00 100644
--- a/src/lib.js
+++ b/src/lib.js
@@ -8,6 +8,7 @@ var got = require('got'),
     Promise = require('bluebird'),
     fs = Promise.promisifyAll(require('fs')),
     glob = Promise.promisify(require('glob')),
+    semver = require('semver'),
     PURESCRIPT_REPO_API_URL = 'https://api.github.com/repos/purescript/purescript',
     PURESCRIPT_DOWNLOAD_URL = 'https://github.com/purescript/purescript';
 
@@ -15,7 +16,8 @@ function getReleases() {
     return gotGithubApi('/releases')
         .then(util.parseResponseBody)
         .then(function (body) {
-            return R.map(R.prop('tag_name'), body);
+            var releases = R.map(R.prop('tag_name'), body);
+            return R.filter(releases => semver.valid(releases), releases);
         });
 }
 
@@ -55,11 +57,13 @@ function installVersion(version) {
 
     return getReleases()
         .then(function (releases) {
-            if (R.contains(version, releases)) {
-                return downloadVersion(version, osType)
+            var matchingVersion = semver.maxSatisfying(releases, version);
+
+            if (matchingVersion) {
+                return downloadVersion(matchingVersion, osType)
                     .then(function () {
-                        util.createNonExistingDir(path.join(paths.PSVM_VERSIONS, version));
-                        return util.extract(path.join(paths.PSVM_ARCHIVES, version + '-' + osType + '.tar.gz'), path.join(paths.PSVM_VERSIONS, version));
+                        util.createNonExistingDir(path.join(paths.PSVM_VERSIONS, matchingVersion));
+                        return util.extract(path.join(paths.PSVM_ARCHIVES, matchingVersion + '-' + osType + '.tar.gz'), path.join(paths.PSVM_VERSIONS, matchingVersion));
                     });
             } else {
                 return new Promise(function (resolve, reject) {