fix 301 and 404 links

README.md

@@ -127,7 +127,7 @@ See also [Friends of Rust](https://www.rust-lang.org/friends.html)(organizations
 
 ### Database
 
-* [pingcap/tikv](https://github.com/pingcap/tikv) — a distributed KV database in Rust [<img src="https://api.travis-ci.org/pingcap/tikv.svg?branch=master">](https://travis-ci.org/pingcap/tikv)
+* [tikv](https://github.com/tikv/tikv) — a distributed KV database in Rust [<img src="https://circleci.com/gh/tikv/tikv.svg?style=shield&circle-token=36bab0a8e43edb0941b31c38557d2d9d0d58f708">](https://circleci.com/gh/tikv/tikv)
 * [PumpkinDB](https://github.com/PumpkinDB/PumpkinDB) — an event sourcing database engine [<img src="https://api.travis-ci.org/PumpkinDB/PumpkinDB.svg?branch=master">](https://travis-ci.org/PumpkinDB/PumpkinDB)
 * [seppo0010/rsedis](https://github.com/seppo0010/rsedis) — a Redis reimplementation in Rust [<img src="https://api.travis-ci.org/seppo0010/rsedis.svg?branch=master">](https://travis-ci.org/seppo0010/rsedis)
 * [Mentat](https://mozilla.github.io/mentat/) - Project Mentat is a persistent, embedded knowledge base. It draws heavily on DataScript and Datomic. Mentat is intended to be a flexible relational (not key-value, not document-oriented) store that makes it easy to describe, grow, and reuse your domain schema.
@@ -549,7 +549,7 @@ See also [Are we (I)DE yet?](https://areweideyet.com/) and [Rust and IDEs](https
 * Pipeline
   * [imp/pager-rs](https://gitlab.com/imp/pager-rs) [[pager](https://crates.io/crates/pager)] — pipe your output through an external pager [<img src="https://gitlab.com/imp/pager-rs/badges/master/build.svg">](https://gitlab.com/imp/pager-rs/pipelines)
   * [hniksic/rust-subprocess](https://github.com/hniksic/rust-subprocess) [[subprocess](https://crates.io/crates/subprocess)] — facilities for interaction with external pipelines [<img src="https://api.travis-ci.org/hniksic/rust-subprocess.svg?branch=master">](https://travis-ci.org/hniksic/rust-subprocess)
-  * [oconnor663/duct.rs](https://github.com/oconnor663/duct.rs) [[duct](https://crates.io/crates/duct)] — a builder for subprocess pipelines and IO redirection [<img src="https://travis-ci.org/oconnor663/duct.rs.svg?branch=master">](https://travis-ci.org/oconnor663/duct.rs)
+  * [oconnor663/duct.rs](https://github.com/oconnor663/duct.rs) [[duct](https://crates.io/crates/duct)] — a builder for subprocess pipelines and IO redirection [<img src="https://api.travis-ci.org/oconnor663/duct.rs.svg?branch=master">](https://travis-ci.org/oconnor663/duct.rs)
   * [philippkeller/rexpect](https://github.com/philippkeller/rexpect) [[rexpect](https://crates.io/crates/rexpect)] — automate interactive applications such as ssh, ftp, passwd, etc [<img src="https://api.travis-ci.org/philippkeller/rexpect.svg?branch=master">](https://travis-ci.org/philippkeller/rexpect)
 * Progress
   * [mitsuhiko/indicatif](https://github.com/mitsuhiko/indicatif) [[indicatif](https://crates.io/crates/indicatif)] — indicate progress to users
@@ -565,7 +565,7 @@ See also [Are we (I)DE yet?](https://areweideyet.com/) and [Rust and IDEs](https
 * TUI
   * [TimonPost/crossterm](https://github.com/TimonPost/crossterm) [[crossterm](https://crates.io/crates/crossterm)] — crossplatform terminal library
   * [gyscos/Cursive](https://github.com/gyscos/Cursive) [[cursive](https://crates.io/crates/cursive)] — build rich TUI applications [<img src="https://api.travis-ci.org/gyscos/Cursive.svg?branch=master">](https://travis-ci.org/gyscos/Cursive) 
-  * [ogham/rust-term-grid](https://github.com/ogham/rust-term-grid) [[term_grid](https://crates.io/crates/term_grid)] — Rust library for putting things in a grid [<img src="https://travis-ci.org/ogham/rust-term-grid.svg?branch=master">](https://travis-ci.org/ogham/rust-term-grid)
+  * [ogham/rust-term-grid](https://github.com/ogham/rust-term-grid) [[term_grid](https://crates.io/crates/term_grid)] — Rust library for putting things in a grid [<img src="https://api.travis-ci.org/ogham/rust-term-grid.svg?branch=master">](https://travis-ci.org/ogham/rust-term-grid)
   * [ticki/termion](https://github.com/redox-os/termion) [[termion](https://crates.io/crates/termion)] — bindless library for controlling terminals/TTY  [<img src="https://api.travis-ci.org/ticki/termion.svg?branch=master">](https://travis-ci.org/ticki/termion)
   * [fdehau/tui-rs](https://github.com/fdehau/tui-rs) [[tui](https://crates.io/crates/tui)] — a TUI library inspired by [blessed-contrib](https://github.com/yaronn/blessed-contrib) and [termui](https://github.com/gizak/termui) [<img src="https://api.travis-ci.org/fdehau/tui-rs.svg?branch=master">](https://travis-ci.org/fdehau/tui-rs)
   * BearLibTerminal