v0.19.1

Fixing invalid agent issue (#1904)
Fix ignore set withCredentials false (#2582)
Delete useless default to hash (#2458)
Fix HTTP/HTTPs agents passing to follow-redirect (#1904)
Fix ignore set withCredentials false (#2582)
Fix CI build failure (#2570)
Remove dependency on is-buffer from package.json (#1816)
Adding options typings (#2341)
Adding Typescript HTTP method definition for LINK and UNLINK. (#2444)
Update dist with newest changes, fixes Custom Attributes issue
Change syntax to see if build passes (#2488)
Update Webpack + deps, remove now unnecessary polyfills (#2410)
Fix to prevent XSS, throw an error when the URL contains a JS script (#2464)
Add custom timeout error copy in config (#2275)
Add error toJSON example (#2466)
Fixing Vulnerability A Fortify Scan finds a critical Cross-Site Scrip… (#2451)
Fixing subdomain handling on no_proxy (#2442)
Make redirection from HTTP to HTTPS work ([#2426](https://github.com/axios/axios/pull/2426] and (#2547)
Add toJSON property to AxiosError type (#2427)
Fixing socket hang up error on node side for slow response. (#1752)
Alternative syntax to send data into the body (#2317)
Fixing custom config options (#2207)
Fixing set config.method after mergeConfig for Axios.prototype.request (#2383)
Axios create url bug (#2290)
Do not modify config.url when using a relative baseURL (resolves #1628) (#2391)
Add typescript HTTP method definition for LINK and UNLINK (#2444)

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