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Update 04_energy.ipynb

It seems that optimization method should be 'Powell', L-BFGS-B fails to find equlibrium configuration, when changing it to Powell, program gives a solution that is displaed in rendered mode

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Original file line number	Diff line number	Diff line change
`@@ -243,7 +243,7 @@`
`243`	`243`	`"outputs": [],`
`244`	`244`	`"source": [`
`245`	`245`	`"P1 = opt.minimize(energy, P0.ravel(),\n",`
`246`		`- " method='L-BFGS-B',\n",`
	`246`	`+ " method='Powell',\n",`
`247`	`247`	`" bounds=bounds).x.reshape((-1, 2))"`
`248`	`248`	`]`
`249`	`249`	`},`

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Commit 9e61389

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`‎chapter09_numoptim/04_energy.ipynb`

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