bats: upgrade 1.5.0 -> 1.6.0

Changelog:
=========
Added:
-----
new flag --code-quote-style (and $BATS_CODE_QUOTE_STYLE) to customize
quotes around code blocks in error output (openembedded#506)
an example/regression test for running background tasks without blocking the
test run (openembedded#525, openembedded#535)
bats_load_library for loading libraries from the search path
$BATS_LIB_PATH (openembedded#548)

Fixed:
-----
improved error trace for some broken cases (openembedded#279)
removed leftover debug file /tmp/latch in selftest suite
(single use latch) (openembedded#516)
fix recurring errors on CTRL+C tests with NPM on Windows in selftest suite (openembedded#516)
fixed leaking of local variables from debug trap (openembedded#520)
don't mark FD3 output from teardown_file as <failure> in junit output (openembedded#532)
fix unbound variable error with Bash pre 4.4 (openembedded#550)

Documentation:
--------------
remove links to defunct freenode IRC channel (openembedded#515)
improved grammar (openembedded#534)
fixed link to TAP spec (openembedded#537)

Signed-off-by: Wang Mingyu <[email protected]>
Signed-off-by: Khem Raj <[email protected]>

meta-oe/recipes-test/bats/bats_1.5.0.bb → meta-oe/recipes-test/bats/bats_1.6.0.bb

@@ -8,7 +8,7 @@ LIC_FILES_CHKSUM = "file://LICENSE.md;md5=2970203aedf9e829edb96a137a4fe81b"
 
 SRC_URI = "git://github.com/bats-core/bats-core.git;branch=master;protocol=https"
 # v1.4.1
-SRCREV = "99d64eb017abcd6a766dd0d354e625526da69cb3"
+SRCREV = "210acf3a8ed318ddedad3137c15451739beba7d4"
 
 S = "${WORKDIR}/git"