* doc: update readme

* feat: histogram

* Fix warning for hdfs

* Update docs.

changes made:
1. adjusted path to relative path
2. added an installation method (installing by coding)
Co-authored-by: NZeyu Chen <chenzeyu01@baidu.com>

* fix: public path cannot be set to root path if not in api mode

* fix: use position argument

* fix: support legacy call method

* doc: update document

Modify logo position

* * Support starting vdl in python.

* Fix null point error.

* Add introduction to python startup method in README.md.

* Fix blank picture cause of scalar null response.

* update README

* release 1.3.0

* update README

* New logo

* Remove ewww line

* Add virtualenv and anaconda
* Remove overlap guide
* Clarify some confusing language

* Adjust the sync_cycle automatically.

* Change the multiplier type to double.

* Adjust the sync_period.

* Fix comment.

* Add the pre-commit

* Run pre-commit with other files.

* Update the version number
Update the doc to include Vue
Update the doc to give more details on the sync_cycle
Update the doc to include python 3

* Update the LogWriter constructor doc.

* Update the package copy directory.

* Update the version to 0.0.2 (implying beta now)

* Update the vdl_create_scratch_log to python 3 as well.

* Include the Graph requirement, GraphViz` in docs.

* Provide information to the ONNX format model export.

* Ask the user to download Graphviz via the website instead of brew.

* rename vdl_scratch.py to vdl_create_scratch_log

* Simply replace the vdl_scratch.py

* Provide instructions on virtualenv.

* Clean up the detail a little bit.

* Add travis-ci job to deploy docs to visualdl.paddlepaddle.org.  Update readme's to correctly show all images.

* Add SSH known hosts

* Add in additional restrictions for documentation deploy:
* Only deploy on merge to 'develop' branch

* Update README.md

Fix typo in the README python SDK example.

* Fix the typo in readme.cn