spelling: it's a

Signed-off-by: Josh Soref <[email protected]>

Author: jsoref

gsoc/2017.md

@@ -227,7 +227,7 @@ Supervised by [@MasseGuillaume](https://github.com/MasseGuillaume) and/or
 Scala-Native is a new target for Scala. Instead of compiling to bytecode and running on the JVM, we
 use llvm to generate native assembly code. We currently do not compile Java to llvm. Therefore we need
 to reimplement some parts of JDK such as `java.net.*`, `java.io.*`, `java.nio.*` and `java.util.*`. We are already
-reimplementing the JDK and we need your help to increase our coverage. It'a unique chance to learn
+reimplementing the JDK and we need your help to increase our coverage. It's a unique chance to learn
 how to implement the java api and write low level Scala code.
 
 Supervised by [@MasseGuillaume](https://github.com/MasseGuillaume)