fix: fix a typo in readme (#134)

Author: wvffle

README.md

@@ -29,7 +29,7 @@ $ npm i --save-dev @intlify/vue-i18n-extensions@next
 
 ### Server-side rendering for `v-t` custom directive
 
-You can use tnrasform offered with this package, to support Server-side rendering for `v-t` custom directives.
+You can use transform offered with this package, to support Server-side rendering for `v-t` custom directives.
 
 In order to use this feature, you need to specify to Vue compiler option.
 The following example that use `compile` of `@vue/compiler-ssr`: