Merge pull request #48 from bergzand/pr/conf-spell

Fix typo in configure.h
diff --git a/src/configure.h b/src/configure.h
index 1be4d3f..309a53a 100644
--- a/src/configure.h
+++ b/src/configure.h
@@ -1,5 +1,5 @@
 //
-//  Determine which cryptographic library we are goig to be usig
+//  Determine which cryptographic library we are going to be using
 //
 
 #if defined(USE_MBED_TLS)