patch 9.0.0084: using "terraform" filetype for .tfvars file is bad

Problem:    Using "terraform" filetype for .tfvars file is bad.
Solution:   use "terraform-vars", so that different completion and other
            mechanisms can be used. (Radek Simko, closes #10755)
diff --git a/src/testdir/test_filetype.vim b/src/testdir/test_filetype.vim
index b504429..ea7bf3e 100644
--- a/src/testdir/test_filetype.vim
+++ b/src/testdir/test_filetype.vim
@@ -549,7 +549,7 @@
     \ 'template': ['file.tmpl'],
     \ 'teraterm': ['file.ttl'],
     \ 'terminfo': ['file.ti'],
-    \ 'terraform': ['file.tfvars'],
+    \ 'terraform-vars': ['file.tfvars'],
     \ 'tex': ['file.latex', 'file.sty', 'file.dtx', 'file.ltx', 'file.bbl'],
     \ 'texinfo': ['file.texinfo', 'file.texi', 'file.txi'],
     \ 'texmf': ['texmf.cnf'],
diff --git a/src/version.c b/src/version.c
index 7f4b42d..03b65d2 100644
--- a/src/version.c
+++ b/src/version.c
@@ -736,6 +736,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    84,
+/**/
     83,
 /**/
     82,