docs: website for LiquidJS

docs/source/tutorials/migrate-to-9.md

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+---
+title: Migrate to LiquidJS 9
+---
+
+LiquidJS 9 has some fundamental improvements, including bugfixes, new features and performance improvement due to higher target(see #137). There're also some breaking changes.
+
+## Features
+
+* Sync rendering: renderSync, parseAndRenderSync, renderFileSync
+* New utils: Expression
+
+## Fixes
+
+* Rewrite boolean expression evaluation order, [#130](https://github.com/harttle/liquidjs/issues/130);
+* `break` and `continue` tags omitting output before them, [#123](https://github.com/harttle/liquidjs/issues/123);
+* Fixes errors in React.js demo during yarn install, [#145](https://github.com/harttle/liquidjs/issues/145);
+* Promise typed Drops are not await-ed some times.
+
+## Performance
+
+* Performance Improvements due to targeting to Node.js 8, see [#137](https://github.com/harttle/liquidjs/issues/137);
+* Memory footprint is reduced by 57.5%, see [#202](https://github.com/harttle/liquidjs/pull/202);
+* Render performance is improved by 100.3%, see [#205](https://github.com/harttle/liquidjs/pull/205).
+
+## BREAKING CHANGES
+
+* LiquidJS no longer has a default export, use `import {Liquid} from 'liquidjs'` instead. The `window.Liquid` for the UMD bundle is also changed to `window.liquidjs.Liquid`;
+* The duplicate static method `Liquid.evalValue` is removed, use the instance method `liquid.evalValue` instead;
+* Shipped to Node.js 8, the CJS bundle (main entry in Node.js) nolonger supports Node.js ≤ 6. ESM (dist/liquid.esm.js) and UMD (dist/liquid.js, dist/liquid.min.js) bundles are not affected.