patch 8.1.0429: no test for :lcd with 'shellslash'

Problem:    No test for :lcd with 'shellslash'.
Solution:   Add a test. (Daniel Hahler, closes #3475)
diff --git a/src/testdir/test_getcwd.vim b/src/testdir/test_getcwd.vim
index 334b890..5d97295 100644
--- a/src/testdir/test_getcwd.vim
+++ b/src/testdir/test_getcwd.vim
@@ -98,3 +98,15 @@
 	call assert_equal("z Xdir3 1", GetCwdInfo(1, tp_nr))
 	call assert_equal(g:topdir, getcwd(-1))
 endfunc
+
+function Test_GetCwd_lcd_shellslash()
+	new
+	let root = fnamemodify('/', ':p')
+	exe 'lcd '.root
+	let cwd = getcwd()
+	if !exists('+shellslash') || &shellslash
+		call assert_equal(cwd[-1:], '/')
+	else
+		call assert_equal(cwd[-1:], '\')
+	endif
+endfunc
diff --git a/src/version.c b/src/version.c
index 724c9aa..c62e484 100644
--- a/src/version.c
+++ b/src/version.c
@@ -795,6 +795,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    429,
+/**/
     428,
 /**/
     427,