Update readme

README.md

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-# PGInsight
-CLI tool to easily dig deep inside your PostgreSQL database.
-
-# Features
-- Index usage
-- Find unused indexes
-- Find duplicate indexes
-- Disk usage for every database
-- Disk usage for all tables in a given database
-- Cache hits ratio for a given database
-- Cache hits per table
-- Find slow queries
-- Self-contained binary, no dependencies
-
-# Installation
-- **Step 1**: Download binary from https://github.com/lafikl/pginsight/releases
-- **Step 2**: There's no step 2!
-
-# Usage
-```
-Usage:
-PGINSIGHT_DBURL="postgres://username:password@localhost/dbname?sslmode=disable" ./pginsight <cmdname> [subcommand]
-
-Commands:
-    index usage
-        Shows which indexes are being scanned and how many tuples are fetched
-    index unused
-        Shows the indexes which haven't been scanned
-    index duplicate
-        Finds indexes which index on the same key(s)
-
-    disk db
-        Shows disk usage for all databases accessible from the configured user
-    disk tables
-        Show disk usage for all tables in the configured database
-
-    cache total
-        Shows the total number of cache hits in the database
-    cache tables
-        Breakdown of cache hits per table
-
-    queries
-        Shows the slowest 10 queries.
-```
-
-
-# Example
-PGINSIGHT_DBURL="postgres://klafi:eee@localhost/test?sslmode=disable" ./pginsight queries
-
-
-# License
-The MIT License (MIT)
-
-Copyright (c) 2016 Khalid Lafi
-
-Permission is hereby granted, free of charge, to any person obtaining a copy
-of this software and associated documentation files (the "Software"), to deal
-in the Software without restriction, including without limitation the rights
-to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-copies of the Software, and to permit persons to whom the Software is
-furnished to do so, subject to the following conditions:
-
-The above copyright notice and this permission notice shall be included in all
-copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
-SOFTWARE.
+http://pginsight.io