[PATCH v2 2/5] travis: build HTML docs

[Heinrich Schuchardt]

Several patches delivered incorrect restructured text as documentation.
We should be able to discover this in Travis CI.

Provide a build step for 'make htmldocs'.

Add required package graphviz.

Signed-off-by: Heinrich Schuchardt <xypron.glpk at gmx.de>
---
v2:
	change sequence of targets: put htmldocs after cppcheck
---
 .travis.yml | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/.travis.yml b/.travis.yml
index e6db9d6a72..911c85e130 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -38,6 +38,7 @@ addons:
     - libisl15
     - clang-7
     - srecord
+    - graphviz

 install:
  # Clone uboot-test-hooks
@@ -352,6 +353,10 @@ matrix:
     - name: "cppcheck"
       script:
         - cppcheck --force --quiet --inline-suppr .
+    # build HTML documentation
+    - name: "htmldocs"
+      script:
+        - make htmldocs
     # search for TODO within source tree
     - name: "grep TODO"
       script:
--
2.25.0