Fix after hooks inside computed

[xaviergonz]

Closes #967

Requires mobx 4.5.0 || 5.5.0

Also included:

• updated dependencies
• fixed examples

[xaviergonz]

@mweststrate does the requirement of mobx 5.5 / 4.5 make this a breaking change?

[xaviergonz]

Avoided making it a breaking change by checking if the peer mobx version exposes the required functionality. Either way when installing the version and the wron mobx peer dep is installed yarn will issue a warn like [email protected]" has unmet peer dependency "mobx@>=4.5.0 <5.0.0 || >=5.5.0 <6.0.0"., but will work as it used to.

[xaviergonz]

merging since the fix itself is pretty simple:

fireHook(name: string) {
        const fn =
            this.storedValue && typeof this.storedValue === "object" && this.storedValue[name]
        if (typeof fn === "function") {
            // we check for it to allow old mobx peer dependencies that don't have the method to work (even when still bugged)
            if (_allowStateChangesInsideComputed) {
                _allowStateChangesInsideComputed(() => {
                    fn.apply(this.storedValue)
                })
            } else {
                fn.apply(this.storedValue)
            }
        }
    }

the rest is just fixing the unmaintained examples and updating dev deps